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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">As filed with the Securities and Exchange Commission on March&nbsp;11, 2014</font></b></p>
<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Registration No.&nbsp;333 -&nbsp;&nbsp;&nbsp;</font></b></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">UNITED STATES<br> SECURITIES AND EXCHANGE COMMISSION</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">WASHINGTON, D.C. 20549</font></b></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">FORM&nbsp;S-8</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="3" face="Times New Roman" style="font-size:12.0pt;font-weight:bold;">REGISTRATION STATEMENT<br> under the<br> SECURITIES ACT OF 1933</font></b></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="5" face="Times New Roman" style="font-size:18.0pt;font-weight:bold;">SYNTA PHARMACEUTICALS CORP.</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Exact Name of Registrant as Specified in Its Charter<i>)</i></font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">45 Hartwell Avenue</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Delaware</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Lexington, Massachusetts 02421</font></b></p>    </td>
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<p style="margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">04-3508648</font></b></p>    </td>   </tr>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(State or Other Jurisdiction</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(Address,&nbsp;Including Zip   Code, of</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(I.R.S. Employer</font></p>    </td>   </tr>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">of Incorporation or Organization</font><font size="2" style="font-size:10.0pt;">)</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Principal Executive Offices</font><font size="2" style="font-size:10.0pt;">)</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Identification No.</font><font size="2" style="font-size:10.0pt;">)</font></p>    </td>   </tr>  </table>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">SYNTA PHARMACEUTICALS CORP. AMENDED AND RESTATED 2006 STOCK PLAN</font></b><i><font size="2" style="font-size:10.0pt;font-style:italic;"><br> &#160;</font></i><font size="2" style="font-size:10.0pt;">(Full Title of the Plan<i>)</i></font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Keith S. Ehrlich</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Chief Financial Officer<br> Synta Pharmaceuticals Corp.<br> 45 Hartwell Avenue <br> Lexington, Massachusetts 02421</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">(781) 274-8200</font></b><font size="2" style="font-size:10.0pt;"><br> (Name, Address and Telephone Number,&nbsp;Including Area Code, of Agent For Service)</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company.&#160; See the definitions of &#147;large accelerated filer,&#148; &#147;accelerated filer&#148; and &#147;smaller reporting company&#148; in Rule&nbsp;12b-2 of the Exchange Act.&#160; (Check one):</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Large   accelerated filer </font><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Accelerated   filer </font><font size="2" face="Wingdings" style="font-size:10.0pt;">x</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Non-accelerated   filer </font><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font><font size="2" style="font-size:10.0pt;"> (Do not   check if a smaller reporting company)</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Smaller   reporting company </font><font size="2" face="Wingdings" style="font-size:10.0pt;">o</font></p>    </td>   </tr>  </table>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">CALCULATION OF REGISTRATION FEE</font></b></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>   </tr>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Title&nbsp;of<br>   &nbsp;Securities&nbsp;to&nbsp;be&nbsp;Registered</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Amount&nbsp;to&nbsp;be<br>   &nbsp;Registered(1)</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Proposed<br>   &nbsp;Maximum<br>   &nbsp;Offering&nbsp;Price<br>   &nbsp;Per&nbsp;Share(2)</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Proposed<br>   &nbsp;Maximum<br>   &nbsp;Aggregate<br>   &nbsp;Offering&nbsp;Price(2)</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Amount&nbsp;of<br>   &nbsp;Registration&nbsp;Fee</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Common Stock, $0.0001 par value</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1,300,000</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="1%" valign="bottom" bgcolor="black" style="background:white;border:none;border-bottom:double windowtext 2.25pt;padding:0in 0in 0in 0in;width:1.3%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>    </td>
<td width="10%" valign="bottom" bgcolor="black" style="background:white;border:none;border-bottom:double windowtext 2.25pt;padding:0in 0in 0in 0in;width:10.7%;">
<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5.215</font></p>    </td>
<td width="2%" valign="bottom" bgcolor="black" style="background:white;border:none;border-bottom:double windowtext 2.25pt;padding:0in 0in 0in 0in;width:2.5%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="1%" valign="bottom" bgcolor="black" style="background:white;border:none;border-bottom:double windowtext 2.25pt;padding:0in 0in 0in 0in;width:1.3%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>    </td>
<td width="10%" valign="bottom" bgcolor="black" style="background:white;border:none;border-bottom:double windowtext 2.25pt;padding:0in 0in 0in 0in;width:10.7%;">
<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">6,779,500</font></p>    </td>
<td width="2%" valign="bottom" bgcolor="black" style="background:white;border:none;border-bottom:double windowtext 2.25pt;padding:0in 0in 0in 0in;width:2.5%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="1%" valign="bottom" bgcolor="black" style="background:white;border:none;border-bottom:double windowtext 2.25pt;padding:0in 0in 0in 0in;width:1.3%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>    </td>
<td width="10%" valign="bottom" bgcolor="black" style="background:white;border:none;border-bottom:double windowtext 2.25pt;padding:0in 0in 0in 0in;width:10.7%;">
<p align="right" style="margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">873.20</font></p>    </td>
<td width="1%" valign="bottom" bgcolor="black" style="background:white;border:none;border-bottom:double windowtext 2.25pt;padding:0in 0in 0in 0in;width:1.0%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.58%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(1)</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.14%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="94%" colspan="13" valign="top" style="padding:0in 0in 0in 0in;width:94.28%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The   number of shares of common stock, par value $0.0001 per share (&#147;Common   Stock&#148;), stated above consists of 1,300,000 additional shares which may be   sold upon the exercise of options or issuance of stock awards which may   hereafter be granted under the Synta Pharmaceuticals Corp. Amended and   Restated 2006 Stock Plan (the &#147;2006 Plan&#148;). The maximum number of shares   which may be sold upon the exercise of options or issuance of stock awards   granted under the 2006 Plan is subject to adjustment in accordance with   certain anti-dilution and other provisions of the 2006 Plan. Accordingly,   pursuant to Rule&nbsp;416 under the Securities Act of 1933, as amended (the   &#147;Securities Act&#148;), this Registration Statement covers, in addition to the   number of shares stated above, an indeterminate number of shares which may be   subject to grant or otherwise issuable upon the operation of any such   anti-dilution and other provisions of the 2006 Plan.</font></p>    </td>   </tr>
<tr>
<td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.58%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.14%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="94%" colspan="13" valign="top" style="padding:0in 0in 0in 0in;width:94.28%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.58%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(2)</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.14%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="94%" colspan="13" valign="top" style="padding:0in 0in 0in 0in;width:94.28%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">This   calculation is made solely for the purpose of determining the registration   fee pursuant to the provisions of Rule&nbsp;457(c)&nbsp;and (h)&nbsp;under   the Securities Act on the basis of the average of the high and low sale   prices per share of the Common Stock on The NASDAQ Global Market as of a date   (March&nbsp;7, 2014) within five business days prior to filing this   Registration Statement.</font></p>    </td>   </tr>
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<td width="27" style="border:none;"></td>
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<td width="264" style="border:none;"></td>
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<td width="90" style="border:none;"></td>
<td width="19" style="border:none;"></td>
<td width="10" style="border:none;"></td>
<td width="80" style="border:none;"></td>
<td width="19" style="border:none;"></td>
<td width="10" style="border:none;"></td>
<td width="80" style="border:none;"></td>
<td width="19" style="border:none;"></td>
<td width="10" style="border:none;"></td>
<td width="80" style="border:none;"></td>
<td width="7" style="border:none;"></td>   </tr> </table>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
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<p style="border:none;margin:0in 0in .0001pt;padding:0in;"><font size="1" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">EXPLANATORY NOTE</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The purpose of this Form&nbsp;S-8 Registration Statement is to reflect an increase of 1,300,000 shares of Common Stock authorized for issuance under the Synta Pharmaceuticals Corp. Amended and Restated 2006 Stock Plan (the &#147;2006 Plan&#148;) by operation of the 2006 Plan&#146;s &#147;evergreen&#148; provision pursuant to which an additional 1,300,000 shares of Common Stock were automatically authorized for issuance under the 2006 Plan on January&nbsp;1, 2014.&#160; Shares of Common Stock issuable under the 2006 Plan were previously registered on the Registration Statement on Form&nbsp;S-8 (File No.&nbsp;333-141903) of the Registrant filed with the Commission on April&nbsp;5, 2007, the Registration Statement on Form&nbsp;S-8 (File No.&nbsp;333-152824) of the Registrant filed with the Commission on August&nbsp;6, 2008, the Registration Statement on Form&nbsp;S-8 (File No.&nbsp;333-173862) of the Registrant filed with the Commission on May&nbsp;2, 2011, the Registration Statement on Form&nbsp;S-8 (File No.&nbsp;333-181117) of the Registrant filed with the Commission on May&nbsp;3, 2012 and, the Registration Statement on Form&nbsp;S-8 (File No.&nbsp;333-187243) of the Registrant filed with the Commission on March&nbsp;14, 2013.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">PART&nbsp;I</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">INFORMATION REQUIRED IN THE SECTION&nbsp;10(a)&nbsp;PROSPECTUS</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><u><font size="2" face="Times New Roman" style="font-size:10.0pt;">Item&nbsp;1. Plan Information</font></u><font size="2" style="font-size:10.0pt;">.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The information required by Item&nbsp;1 is included in documents sent or given by the Registrant to participants in the 2006 Plan covered by this Registration Statement pursuant to Rule&nbsp;428(b)(1)&nbsp;under the Securities Act.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><u><font size="2" face="Times New Roman" style="font-size:10.0pt;">Item&nbsp;2. Registrant Information and Employee Plan Annual Information</font></u><font size="2" style="font-size:10.0pt;">.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The written statement required by Item&nbsp;2 is included in documents sent or given by the Registrant to participants in the 2006 Plan covered by this Registration Statement pursuant to Rule&nbsp;428(b)(1)&nbsp;under the Securities Act.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">PART&nbsp;II</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</font></b></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><u><font size="2" face="Times New Roman" style="font-size:10.0pt;">Item&nbsp;3. Incorporation of Documents by Reference</font></u><font size="2" style="font-size:10.0pt;">.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The following documents filed by the Registrant with the Commission are incorporated herein by reference:</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt .5in;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(a)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">The Registrant&#146;s Annual Report on Form&nbsp;10-K for the fiscal year ended December&nbsp;31, 2013 filed on March&nbsp;11, 2014 (File No.&nbsp;001-33277).</font></p>
<p style="margin:0in 0in .0001pt .5in;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt .5in;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(b)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">The Registrant&#146;s Current Reports on Form&nbsp;8-K filed on January&nbsp;7, 2014, March&nbsp;4, 2014 and March&nbsp;4, 2014 (File No.&nbsp;001-33277).</font></p>
<p style="margin:0in 0in .0001pt .5in;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt .5in;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(c)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">The portions of the Registrant&#146;s Definitive Proxy Statement on Schedule 14A filed on April&nbsp;29, 2013 that are deemed &#147;filed&#148; with the Commission under the Securities Exchange Act of 1934, as amended (the &#147;Exchange Act&#148;) (File No.&nbsp;001-33277).</font></p>
<p style="margin:0in 0in .0001pt .5in;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt .5in;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(d)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">The description of the Registrant&#146;s Common Stock contained in the Registrant&#146;s Registration Statement on Form&nbsp;8-A (File No.&nbsp;001-33277), filed with the Commission under the Exchange Act on January&nbsp;26, 2007, including any amendment or report filed for the purpose of updating such description.</font></p>
<p style="margin:0in 0in .0001pt .5in;text-indent:-.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">All reports and other documents filed by the Registrant after the date hereof pursuant to Sections&nbsp;13(a), 13(c), 14 and 15(d)&nbsp;of the Exchange Act prior to the filing of a post-effective amendment which indicates that all securities offered hereby have been sold or which deregisters all securities then remaining unsold, shall be deemed to be incorporated by reference herein and to be part hereof from the date of filing of such reports and documents. Any statement contained in a document incorporated or deemed to be incorporated by reference herein shall be</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2<a name="PB_2_150919_5335"></a></font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">deemed to be modified or superseded for the purposes of this Registration Statement to the extent that a statement contained herein or in any other subsequently filed document which also is or is deemed to be incorporated by reference herein modifies or supersedes such statement. Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this Registration Statement.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><u><font size="2" face="Times New Roman" style="font-size:10.0pt;">Item&nbsp;4. Description of Securities</font></u><font size="2" style="font-size:10.0pt;">.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not applicable.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><u><font size="2" face="Times New Roman" style="font-size:10.0pt;">Item&nbsp;5. Interests of Named Experts and Counsel</font></u><font size="2" style="font-size:10.0pt;">.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">None.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><u><font size="2" face="Times New Roman" style="font-size:10.0pt;">Item&nbsp;6. Indemnification of Directors and Officers</font></u><font size="2" style="font-size:10.0pt;">.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The Registrant&#146;s restated certificate of incorporation limits the liability of its officers and directors to the fullest extent permitted by the Delaware General Corporation Law and provides that the Registrant will indemnify them to the fullest extent permitted by such law. The Registrant has also entered into indemnification agreements with its current and former directors and certain of its officers and key employees and expects to enter into a similar agreement with any new directors, officers or key employees.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><u><font size="2" face="Times New Roman" style="font-size:10.0pt;">Item&nbsp;7. Exemption from Registration Claimed</font></u><font size="2" style="font-size:10.0pt;">.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Not applicable.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><u><font size="2" face="Times New Roman" style="font-size:10.0pt;">Item&nbsp;8. Exhibits</font></u><font size="2" style="font-size:10.0pt;">.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The Index of Exhibits immediately following the signatures to this Registration Statement is incorporated herein by reference.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><u><font size="2" face="Times New Roman" style="font-size:10.0pt;">Item&nbsp;9. Undertakings</font></u><font size="2" style="font-size:10.0pt;">.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(a)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">The undersigned Registrant hereby undertakes:</font></p>
<p style="margin:0in 0in .0001pt 11.5pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt 11.5pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(1)&nbsp;To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:</font></p>
<p style="margin:0in 0in .0001pt 11.5pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt 23.0pt;text-indent:13.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(i)&nbsp;To include any prospectus required by Section&nbsp;10(a)(3)&nbsp;of the Securities Act of 1933;</font></p>
<p style="margin:0in 0in .0001pt 23.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt 23.0pt;text-indent:13.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(ii)&nbsp;To reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the Commission pursuant to Rule&nbsp;424(b)&nbsp;if, in the aggregate, the changes in volume and price represent no more than a 20% change in the maximum aggregate offering price set forth in the &#147;Calculation of Registration Fee&#148; table in the effective registration statement.</font></p>
<p style="margin:0in 0in .0001pt 23.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt 23.0pt;text-indent:13.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(iii)&nbsp;To include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement;</font></p>
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<p style="margin:0in 0in .0001pt 11.5pt;text-indent:24.5pt;"><i><font size="2" face="Times New Roman" style="font-size:10.0pt;font-style:italic;">Provided, however</font></i><font size="2" style="font-size:10.0pt;">, that paragraphs (a)(1)(i)&nbsp;and (a)(1)(ii)&nbsp;do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the Commission by the Registrant pursuant to Section&nbsp;13 or Section&nbsp;15(d)&nbsp;of the Securities Exchange Act of 1934 that are incorporated by reference in this registration statement.</font></p>
<p style="margin:0in 0in .0001pt 11.5pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt 11.5pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(2)&nbsp;That, for the purpose of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3<a name="PB_3_151034_5796"></a></font></p>
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<p style="margin:0in 0in .0001pt 11.5pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt 11.5pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(3)&nbsp;To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The   undersigned Registrant hereby undertakes that, for purposes of determining   any liability under the Securities Act of 1933, each filing of the   Registrant&#146;s annual report pursuant to Section&nbsp;13(a)&nbsp;or   Section&nbsp;15(d)&nbsp;of the Securities Exchange Act of 1934 (and, where   applicable, each filing of an employee benefit plan&#146;s annual report pursuant   to Section&nbsp;15(d)&nbsp;of the Securities Exchange Act of 1934) that is   incorporated by reference in this registration statement shall be deemed to   be a new registration statement relating to the securities offered therein,   and the offering of such securities at that time shall be deemed to be the   initial bona fide offering thereof.</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(c)</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Insofar   as indemnification for liabilities arising under the Securities Act of 1933   may be permitted to directors, officers and controlling persons of the   Registrant pursuant to the foregoing provisions, or otherwise, the Registrant   has been advised that in the opinion of the Securities and Exchange   Commission such indemnification is against public policy as expressed in the   Act and is, therefore, unenforceable. In the event that a claim for   indemnification against such liabilities (other than the payment by the   Registrant of expenses incurred or paid by a director, officer or controlling   person of the Registrant in the successful defense of any action, suit or   proceeding) is asserted by such director, officer or controlling person in   connection with the securities being registered, the Registrant will, unless   in the opinion of its counsel the matter has been settled by controlling   precedent, submit to a court of appropriate jurisdiction the question whether   such indemnification by it is against public policy as expressed in the Act   and will be governed by the final adjudication of such issue.</font></p>    </td>   </tr>  </table>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4<a name="PB_4_151329_2897"></a></font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">SIGNATURES</font></b></p>
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<p style="margin:0in 0in .0001pt;text-indent:.5in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">The Registrant.</font></b><font size="2" style="font-size:10.0pt;">&#160; Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form&nbsp;S-8 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in Lexington, Massachusetts on March&nbsp;11, 2014.</font></p>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">SYNTA   PHARMACEUTICALS CORP.</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">By</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/   KEITH R. GOLLUST</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="3%" valign="top" style="padding:0in 0in 0in 0in;width:3.34%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Keith   R. Gollust</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Executive   Director</font></p>    </td>   </tr>  </table>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Each person whose signature appears below constitutes and appoints Keith R. Gollust and Keith S. Ehrlich, and each of them singly, his true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution in each of them singly, for him and in his name, place and stead, and in any and all capacities, to sign any and all amendments (including post-effective amendments) to this Registration Statement of Synta Pharmaceuticals Corp. and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting to the attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite or necessary to be done in or about the premises, as full to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that the attorneys-in-fact and agents or any of each of them or their substitute may lawfully do or cause to be done by virtue hereof.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p style="margin:0in 0in .0001pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated.</font></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Signature</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Title</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Date</font></b></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/   KEITH R. GOLLUST</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Executive   Chairman and</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">March&nbsp;11,   2014</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Keith   R. Gollust</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Chairman   of the Board (principal executive officer)</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/   KEITH S. EHRLICH, C.P.A.</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Vice   President, Finance</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">March&nbsp;11,   2014</font></p>    </td>   </tr>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Keith   S. Ehrlich, C.P.A.</font></p>    </td>
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<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="35%" valign="top" style="padding:0in 0in 0in 0in;width:35.66%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">and   Administration, Chief Financial Officer (principal financial and accounting   officer)</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.98%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="39%" valign="top" style="padding:0in 0in 0in 0in;width:39.6%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="35%" valign="top" style="padding:0in 0in 0in 0in;width:35.66%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.98%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="39%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:39.6%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/   PAUL A. FRIEDMAN, M.D.</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="35%" valign="top" style="padding:0in 0in 0in 0in;width:35.66%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.98%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">March&nbsp;11,   2014</font></p>    </td>   </tr>
<tr>
<td width="39%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:39.6%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Paul   A. Friedman, M.D.</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="35%" valign="top" style="padding:0in 0in 0in 0in;width:35.66%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.98%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="39%" valign="top" style="padding:0in 0in 0in 0in;width:39.6%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="35%" valign="top" style="padding:0in 0in 0in 0in;width:35.66%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.98%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="39%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:39.6%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/   BRUCE KOVNER</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="35%" valign="top" style="padding:0in 0in 0in 0in;width:35.66%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.98%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">March&nbsp;11,   2014</font></p>    </td>   </tr>
<tr>
<td width="39%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:39.6%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Bruce   Kovner</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="35%" valign="top" style="padding:0in 0in 0in 0in;width:35.66%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.98%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="39%" valign="top" style="padding:0in 0in 0in 0in;width:39.6%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="35%" valign="top" style="padding:0in 0in 0in 0in;width:35.66%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.98%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="39%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:39.6%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/   DONALD W. KUFE, M.D.</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="35%" valign="top" style="padding:0in 0in 0in 0in;width:35.66%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.98%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">March&nbsp;11,   2014</font></p>    </td>   </tr>
<tr>
<td width="39%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:39.6%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Donald   W. Kufe, M.D.</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="35%" valign="top" style="padding:0in 0in 0in 0in;width:35.66%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.98%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="39%" valign="top" style="padding:0in 0in 0in 0in;width:39.6%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="35%" valign="top" style="padding:0in 0in 0in 0in;width:35.66%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.98%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="39%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:39.6%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/   WILLIAM S. REARDON, C.P.A.</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="35%" valign="top" style="padding:0in 0in 0in 0in;width:35.66%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.98%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">March&nbsp;11,   2014</font></p>    </td>   </tr>
<tr>
<td width="39%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:39.6%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">William   S. Reardon, C.P.A.</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="35%" valign="top" style="padding:0in 0in 0in 0in;width:35.66%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.98%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="39%" valign="top" style="padding:0in 0in 0in 0in;width:39.6%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="35%" valign="top" style="padding:0in 0in 0in 0in;width:35.66%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.98%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="39%" valign="top" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:39.6%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">/s/   ROBERT N. WILSON</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="35%" valign="top" style="padding:0in 0in 0in 0in;width:35.66%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Director</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.98%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">March&nbsp;11,   2014</font></p>    </td>   </tr>
<tr>
<td width="39%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:39.6%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Robert   N. Wilson</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="35%" valign="top" style="padding:0in 0in 0in 0in;width:35.66%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.88%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="18%" valign="top" style="padding:0in 0in 0in 0in;width:18.98%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>   </tr>  </table>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5<a name="PB_5_151734_3020"></a></font></p>
<div style="margin:0in 0in .0001pt;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>
</div>
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<br clear="all" style="page-break-before:always;">
<div style="font-family:Times New Roman;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">INDEX OF EXHIBITS</font></b></p>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
<tr>
<td width="13%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:13.7%;">
<p style="margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Exhibit<br>   Number</font></b></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.14%;">
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>    </td>
<td width="84%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in 0in 0in 0in;width:84.16%;">
<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Description</font></b></p>    </td>   </tr>
<tr>
<td width="13%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:13.7%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5.1*</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.14%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="84%" valign="top" style="border:none;padding:0in 0in 0in 0in;width:84.16%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Opinion   of Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C. as to the legality of   shares being registered.</font></p>    </td>   </tr>
<tr>
<td width="13%" valign="top" style="padding:0in 0in 0in 0in;width:13.7%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.14%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="84%" valign="top" style="padding:0in 0in 0in 0in;width:84.16%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="13%" valign="top" style="padding:0in 0in 0in 0in;width:13.7%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">23.1*</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.14%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="84%" valign="top" style="padding:0in 0in 0in 0in;width:84.16%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Consent   of Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C. (included in opinion   of counsel filed as Exhibit&nbsp;5.1).</font></p>    </td>   </tr>
<tr>
<td width="13%" valign="top" style="padding:0in 0in 0in 0in;width:13.7%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.14%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="84%" valign="top" style="padding:0in 0in 0in 0in;width:84.16%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="13%" valign="top" style="padding:0in 0in 0in 0in;width:13.7%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">23.2*</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.14%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="84%" valign="top" style="padding:0in 0in 0in 0in;width:84.16%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Consent   of Ernst and Young LLP,&nbsp;Independent Registered Public Accounting Firm.</font></p>    </td>   </tr>
<tr>
<td width="13%" valign="top" style="padding:0in 0in 0in 0in;width:13.7%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.14%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="84%" valign="top" style="padding:0in 0in 0in 0in;width:84.16%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="13%" valign="top" style="padding:0in 0in 0in 0in;width:13.7%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">24*</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.14%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="84%" valign="top" style="padding:0in 0in 0in 0in;width:84.16%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Power   of Attorney to file future amendments (set forth on the signature   page&nbsp;of this Registration Statement).</font></p>    </td>   </tr>
<tr>
<td width="13%" valign="top" style="padding:0in 0in 0in 0in;width:13.7%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.14%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>
<td width="84%" valign="top" style="padding:0in 0in 0in 0in;width:84.16%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>    </td>   </tr>
<tr>
<td width="13%" valign="top" style="padding:0in 0in 0in 0in;width:13.7%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">99.1</font></p>    </td>
<td width="2%" valign="bottom" style="padding:0in 0in 0in 0in;width:2.14%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>    </td>
<td width="84%" valign="top" style="padding:0in 0in 0in 0in;width:84.16%;">
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The   Registrant&#146;s Amended and Restated 2006 Stock Plan (filed as Exhibit&nbsp;10.1   to the Registrant&#146;s Current Report on Form&nbsp;8-K filed June&nbsp;21, 2010   (File No.001-33277), and incorporated herein by reference).</font></p>    </td>   </tr>  </table>
<p style="margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>
<div style="margin:0in 0in .0001pt;"><hr size="1" width="25%" noshade color="black" align="left"></div>
<p style="margin:0in 0in .0001pt .25in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">*</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font><font size="2" style="font-size:10.0pt;">Filed herewith.</font></p>
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<p align="center" style="margin:0in 0in .0001pt;text-align:center;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">6<a name="PB_6_151834_7748"></a></font></p>
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{"company-data": {"conformed-name": "SYNTA PHARMACEUTICALS CORP", "cik": "0001157601", "assigned-sic": "2834", "irs-number": "000000000", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-194477", "film-number": "14682738"}, "business-address": {"street1": "45 HARTWELL AVE", "city": "LEXINGTON", "state": "MA", "zip": "02421", "phone": "781-274-8200"}}
As filed with the Securities and Exchange Commission on March 11, 2014
Registration No. 333 -
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM S-8
REGISTRATION STATEMENT
under the
SECURITIES ACT OF 1933
SYNTA PHARMACEUTICALS CORP.
(Exact Name of Registrant as Specified in Its Charter
)
45 Hartwell Avenue
Delaware
Lexington, Massachusetts 02421
04-3508648
(State or Other Jurisdiction
(Address, Including Zip   Code, of
(I.R.S. Employer
of Incorporation or Organization
)
Principal Executive Offices
)
Identification No.
)
SYNTA PHARMACEUTICALS CORP. AMENDED AND RESTATED 2006 STOCK PLAN
(Full Title of the Plan
)
Keith S. Ehrlich
Chief Financial Officer
Synta Pharmaceuticals Corp.
45 Hartwell Avenue
Lexington, Massachusetts 02421
(781) 274-8200
(Name, Address and Telephone Number, Including Area Code, of Agent For Service)
Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company.  See the definitions of "large accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act.  (Check one):
Large   accelerated filer
o
Accelerated   filer
x
Non-accelerated   filer
o
(Do not   check if a smaller reporting company)
Smaller   reporting company
o
CALCULATION OF REGISTRATION FEE
Title of
Securities to be Registered
Amount to be
Registered(1)
Proposed
Maximum
Offering Price
Per Share(2)
Proposed
Maximum
Aggregate
Offering Price(2)
Amount of
Registration Fee
Common Stock, $0.0001 par value
1,300,000
$
5.215
$
6,779,500
$
873.20
(1)
The   number of shares of common stock, par value $0.0001 per share ("Common   Stock"), stated above consists of 1,300,000 additional shares which may be   sold upon the exercise of options or issuance of stock awards which may   hereafter be granted under the Synta Pharmaceuticals Corp. Amended and   Restated 2006 Stock Plan (the "2006 Plan"). The maximum number of shares   which may be sold upon the exercise of options or issuance of stock awards   granted under the 2006 Plan is subject to adjustment in accordance with   certain anti-dilution and other provisions of the 2006 Plan. Accordingly,   pursuant to Rule 416 under the Securities Act of 1933, as amended (the   "Securities Act"), this Registration Statement covers, in addition to the   number of shares stated above, an indeterminate number of shares which may be   subject to grant or otherwise issuable upon the operation of any such   anti-dilution and other provisions of the 2006 Plan.
(2)
This   calculation is made solely for the purpose of determining the registration   fee pursuant to the provisions of Rule 457(c) and (h) under   the Securities Act on the basis of the average of the high and low sale   prices per share of the Common Stock on The NASDAQ Global Market as of a date   (March 7, 2014) within five business days prior to filing this   Registration Statement.
EXPLANATORY NOTE
The purpose of this Form S-8 Registration Statement is to reflect an increase of 1,300,000 shares of Common Stock authorized for issuance under the Synta Pharmaceuticals Corp. Amended and Restated 2006 Stock Plan (the "2006 Plan") by operation of the 2006 Plan's "evergreen" provision pursuant to which an additional 1,300,000 shares of Common Stock were automatically authorized for issuance under the 2006 Plan on January 1, 2014.  Shares of Common Stock issuable under the 2006 Plan were previously registered on the Registration Statement on Form S-8 (File No. 333-141903) of the Registrant filed with the Commission on April 5, 2007, the Registration Statement on Form S-8 (File No. 333-152824) of the Registrant filed with the Commission on August 6, 2008, the Registration Statement on Form S-8 (File No. 333-173862) of the Registrant filed with the Commission on May 2, 2011, the Registration Statement on Form S-8 (File No. 333-181117) of the Registrant filed with the Commission on May 3, 2012 and, the Registration Statement on Form S-8 (File No. 333-187243) of the Registrant filed with the Commission on March 14, 2013.
PART I
INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS
Item 1. Plan Information
.
The information required by Item 1 is included in documents sent or given by the Registrant to participants in the 2006 Plan covered by this Registration Statement pursuant to Rule 428(b)(1) under the Securities Act.
Item 2. Registrant Information and Employee Plan Annual Information
.
The written statement required by Item 2 is included in documents sent or given by the Registrant to participants in the 2006 Plan covered by this Registration Statement pursuant to Rule 428(b)(1) under the Securities Act.
PART II
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
Item 3. Incorporation of Documents by Reference
.
The following documents filed by the Registrant with the Commission are incorporated herein by reference:
(a)
The Registrant's Annual Report on Form 10-K for the fiscal year ended December 31, 2013 filed on March 11, 2014 (File No. 001-33277).
(b)
The Registrant's Current Reports on Form 8-K filed on January 7, 2014, March 4, 2014 and March 4, 2014 (File No. 001-33277).
(c)
The portions of the Registrant's Definitive Proxy Statement on Schedule 14A filed on April 29, 2013 that are deemed "filed" with the Commission under the Securities Exchange Act of 1934, as amended (the "Exchange Act") (File No. 001-33277).
(d)
The description of the Registrant's Common Stock contained in the Registrant's Registration Statement on Form 8-A (File No. 001-33277), filed with the Commission under the Exchange Act on January 26, 2007, including any amendment or report filed for the purpose of updating such description.
All reports and other documents filed by the Registrant after the date hereof pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act prior to the filing of a post-effective amendment which indicates that all securities offered hereby have been sold or which deregisters all securities then remaining unsold, shall be deemed to be incorporated by reference herein and to be part hereof from the date of filing of such reports and documents. Any statement contained in a document incorporated or deemed to be incorporated by reference herein shall be
2
deemed to be modified or superseded for the purposes of this Registration Statement to the extent that a statement contained herein or in any other subsequently filed document which also is or is deemed to be incorporated by reference herein modifies or supersedes such statement. Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this Registration Statement.
Item 4. Description of Securities
.
Not applicable.
Item 5. Interests of Named Experts and Counsel
.
None.
Item 6. Indemnification of Directors and Officers
.
The Registrant's restated certificate of incorporation limits the liability of its officers and directors to the fullest extent permitted by the Delaware General Corporation Law and provides that the Registrant will indemnify them to the fullest extent permitted by such law. The Registrant has also entered into indemnification agreements with its current and former directors and certain of its officers and key employees and expects to enter into a similar agreement with any new directors, officers or key employees.
Item 7. Exemption from Registration Claimed
.
Not applicable.
Item 8. Exhibits
.
The Index of Exhibits immediately following the signatures to this Registration Statement is incorporated herein by reference.
Item 9. Undertakings
.
(a)
The undersigned Registrant hereby undertakes:
(1) To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:
(i) To include any prospectus required by Section 10(a)(3) of the Securities Act of 1933;
(ii) To reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than a 20% change in the maximum aggregate offering price set forth in the "Calculation of Registration Fee" table in the effective registration statement.
(iii) To include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement;
Provided, however
, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the Commission by the Registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in this registration statement.
(2) That, for the purpose of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.
3
(3) To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.
(b)
The   undersigned Registrant hereby undertakes that, for purposes of determining   any liability under the Securities Act of 1933, each filing of the   Registrant's annual report pursuant to Section 13(a) or   Section 15(d) of the Securities Exchange Act of 1934 (and, where   applicable, each filing of an employee benefit plan's annual report pursuant   to Section 15(d) of the Securities Exchange Act of 1934) that is   incorporated by reference in this registration statement shall be deemed to   be a new registration statement relating to the securities offered therein,   and the offering of such securities at that time shall be deemed to be the   initial bona fide offering thereof.
(c)
Insofar   as indemnification for liabilities arising under the Securities Act of 1933   may be permitted to directors, officers and controlling persons of the   Registrant pursuant to the foregoing provisions, or otherwise, the Registrant   has been advised that in the opinion of the Securities and Exchange   Commission such indemnification is against public policy as expressed in the   Act and is, therefore, unenforceable. In the event that a claim for   indemnification against such liabilities (other than the payment by the   Registrant of expenses incurred or paid by a director, officer or controlling   person of the Registrant in the successful defense of any action, suit or   proceeding) is asserted by such director, officer or controlling person in   connection with the securities being registered, the Registrant will, unless   in the opinion of its counsel the matter has been settled by controlling   precedent, submit to a court of appropriate jurisdiction the question whether   such indemnification by it is against public policy as expressed in the Act   and will be governed by the final adjudication of such issue.
4
SIGNATURES
The Registrant.
Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in Lexington, Massachusetts on March 11, 2014.
SYNTA   PHARMACEUTICALS CORP.
By
/s/   KEITH R. GOLLUST
Keith   R. Gollust
Executive   Director
Each person whose signature appears below constitutes and appoints Keith R. Gollust and Keith S. Ehrlich, and each of them singly, his true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution in each of them singly, for him and in his name, place and stead, and in any and all capacities, to sign any and all amendments (including post-effective amendments) to this Registration Statement of Synta Pharmaceuticals Corp. and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting to the attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite or necessary to be done in or about the premises, as full to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that the attorneys-in-fact and agents or any of each of them or their substitute may lawfully do or cause to be done by virtue hereof.
Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated.
Signature
Title
Date
/s/   KEITH R. GOLLUST
Executive   Chairman and
March 11,   2014
Keith   R. Gollust
Chairman   of the Board (principal executive officer)
/s/   KEITH S. EHRLICH, C.P.A.
Vice   President, Finance
March 11,   2014
Keith   S. Ehrlich, C.P.A.
and   Administration, Chief Financial Officer (principal financial and accounting   officer)
/s/   PAUL A. FRIEDMAN, M.D.
Director
March 11,   2014
Paul   A. Friedman, M.D.
/s/   BRUCE KOVNER
Director
March 11,   2014
Bruce   Kovner
/s/   DONALD W. KUFE, M.D.
Director
March 11,   2014
Donald   W. Kufe, M.D.
/s/   WILLIAM S. REARDON, C.P.A.
Director
March 11,   2014
William   S. Reardon, C.P.A.
/s/   ROBERT N. WILSON
Director
March 11,   2014
Robert   N. Wilson
5
INDEX OF EXHIBITS
Exhibit
Number
Description
5.1*
Opinion   of Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C. as to the legality of   shares being registered.
23.1*
Consent   of Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C. (included in opinion   of counsel filed as Exhibit 5.1).
23.2*
Consent   of Ernst and Young LLP, Independent Registered Public Accounting Firm.
24*
Power   of Attorney to file future amendments (set forth on the signature   page of this Registration Statement).
99.1
The   Registrant's Amended and Restated 2006 Stock Plan (filed as Exhibit 10.1   to the Registrant's Current Report on Form 8-K filed June 21, 2010   (File No.001-33277), and incorporated herein by reference).
*
Filed herewith.
6