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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>UNITED
        STATES</strong></font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>SECURITIES
        AND EXCHANGE COMMISSION</strong></font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>Washington,
        D.C. 20549</strong></font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>FORM
        8-K</strong></font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>CURRENT
        REPORT</strong></font></div>
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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>PURSUANT
        TO SECTION 13 OR 15(D) OF THE</strong></font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>SECURITIES
        EXCHANGE ACT OF 1934</strong></font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Date
        of
        Report (Date of earliest event reported):</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>
        August 9, 2005</strong></font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 23pt; FONT-FAMILY: Times New Roman"><strong>Sirna
        Therapeutics, Inc.</strong></font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Exact
        name of registrant as specified in its charter)</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
      <div>
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                  </strong></font></div>
              </td>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
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                  </strong></font></div>
              </td>
              <td align="left" valign="top" width="4%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
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              <td valign="top" width="23%">
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                  </strong></font></div>
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                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(State
                  or other jurisdiction </font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">of
                  incorporation) </font></div>
              </td>
              <td align="left" valign="top" width="4%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
              </td>
              <td valign="top" width="23%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Commission
                  File No.) </font></div>
              </td>
              <td align="left" valign="top" width="4%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
              </td>
              <td valign="top" width="23%">
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(I.R.S.
                  Employer </font></div>
                <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Identification
                  Number)</font></div>
              </td>
            </tr>

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      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>185
        Berry Street, Suite 6504</strong></font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>San
        Francisco, California 94107</strong></font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Address
        of principal executive offices) </font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Registrant&#8217;s
        telephone number, including area code:</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>
        (415) 512-7624</strong></font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><br></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>N/A</strong></font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Former
        name or former address, if changed since last report) </font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Check
        the
        appropriate box below if the Form 8-K filing is intended to simultaneously
        satisfy the filing obligation of the registrant under any of the following
        provisions:</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Wingdings">o
</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Written
        communications pursuant to Rule 425 under the Securities Act (17 CFR
        230.425)</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Wingdings">x
</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Soliciting
        material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
        240.14a-12)</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Wingdings">o
</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pre-commencement
        communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR
        240.14d-2(b))</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Wingdings">o
</font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pre-commencement
        communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR
        240.13e-4(c))</font></div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center">&#160;</div>
      <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
        <div id="FTR">
          <div id="GLFTR" style="WIDTH: 100%" align="left">
          </div>
        </div>
        <div id="PN" style="PAGE-BREAK-AFTER: always">
          <div style="WIDTH: 100%; TEXT-ALIGN: center">
          </div>
          <div style="WIDTH: 100%; TEXT-ALIGN: center">
            <hr style="COLOR: black" noshade size="2">
          </div>
        </div>
        <div id="HDR">
          <div id="GLHDR" style="WIDTH: 100%" align="right">
          </div>
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      </div>
      <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">
        <div>
          <table cellpadding="0" cellspacing="0" width="100%">

              <tr>
                <td align="left" colspan="3" valign="top" width="72%">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>ITEM&#160;2.02
                    </strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>RESULTS
                    OF OPERATIONS AND FINANCIAL CONDITIONS</strong></font></div>
                </td>
                <td align="left" valign="top" width="1%">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
                </td>
              </tr>
              <tr>
                <td align="left" colspan="3" valign="top" width="72%">&#160;</td>
                <td align="left" valign="top" width="1%">&#160;</td>
              </tr>
              <tr>
                <td align="left" colspan="3" valign="top" width="72%">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>ITEM
                    7.01 </strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>REGULATION
                    FD DISCLOSURE</strong></font></div>
                </td>
                <td align="left" valign="top" width="1%">&#160;</td>
              </tr>

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        </div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">On
          Tuesday, August 9, 2005, Sirna Therapeutics, Inc. (the &#8220;Company&#8221;) issued a press
          release announcing its financial results for the second quarter ended on
          June
          30, 2005. A copy of the press release is furnished herewith as Exhibit
          99.1 and
          is incorporated herein by reference.</font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Howard
          W.
          Robin, the Company&#8217;s President and CEO, and the Company&#8217;s senior management team
          will discuss these financial results as well as progress to date in the
          Company&#8217;s clinical and preclinical programs during a conference call on Tuesday,
          August 9, 2005 at 4:30 p.m. EDT (2:30 p.m. MDT and 1:30 p.m. PDT). A live
          audio
          webcast of the call will be available at the Company's corporate web site
          at
          www.sirna.com. Participants should log on to the web site 15 minutes prior
          to
          the scheduled start time to download and install any necessary audio software.
          To access the live telephonic broadcast, domestic callers should dial (877)
          407-9039; international callers may dial (201) 689-8470. An audio webcast
          replay
          will be available on the Company&#8217;s web site, www.sirna.com, for 30 days.
          Additionally, a telephonic replay of the call will be maintained through
          11:59
          p.m. EDT, Thursday, August 11, 2005. To access the replay, please dial
          (877)
          660-6853 from the U.S. or (201) 612-7415 when calling internationally,
          using
          account number 3055 and conference number 163090.</font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>IMPORTANT
          ADDITIONAL INFORMATION </strong></font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">On
          July
          22, 2005, the Company filed with the Securities and Exchange Commission
          (the
&#8220;SEC&#8221;) a definitive proxy statement in connection with a private placement.
          Investors and security holders of the Company are urged to read the proxy
          statement because it contains important information about the Company and
          the
          private placement. Investors and security holders of the Company may obtain
          free
          copies of the proxy statement at the SEC's website at http://www.sec.gov,
          at the
          Company&#8217;s website at http://www.sirna.com or by writing to Sirna Therapeutics,
          Inc., 185 Berry Street, Suite 6504, San Francisco, California 94107, Attention:
          Investor Relations. The Company, its directors and the affiliates of a
          majority
          of its directors may be deemed to be participants in the solicitation of
          proxies
          with respect to the private placement. A description of the interests in
          the
          Company of its directors and such affiliates is set forth in the Company&#8217;s proxy
          statement for its 2005 annual meeting of stockholders, filed with the SEC
          on May
          23, 2005 and the proxy statement in connection with the private placement,
          filed
          with the SEC on July 22, 2005. </font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">The
          information contained in these Items 2.02 and 7.01, including Exhibit 99.1,
          is
          being furnished and shall not be deemed to be "filed" for purposes of Section
          18
          of the Securities Exchange Act of 1934, as amended (the "Exchange Act"),
          or
          otherwise subject to the liability of that section. The information contained
          in
          these Items 2.02 and 7.01, including Exhibit 99.1, shall not be incorporated
          by
          reference into any filing under the Securities Act of 1933, as amended,
          or the
          Exchange Act, whether made before or after the date hereof, except as shall
          be
          expressly set forth by specific reference in such filing.</font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div>
        <div>
          <table cellpadding="0" cellspacing="0" width="100%">

              <tr>
                <td align="left" colspan="3" valign="top" width="72%">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>ITEM&#160;9.01
                    </strong></font><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>FINANCIAL
                    STATEMENTS AND EXHIBITS </strong></font></div>
                </td>
                <td align="left" valign="top" width="1%">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
                </td>
              </tr>

          </table>
        </div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>(c)
          Exhibit</strong></font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
        <div>
          <table cellpadding="0" cellspacing="0" width="100%">

              <tr>
                <td valign="top" width="4%">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">99.1
                    </font></div>
                </td>
                <td align="left" valign="top" width="1%">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">&#160;
                    </font></div>
                </td>
                <td align="left" valign="top" width="63%">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Press
                    Release issued by Sirna Therapeutics, Inc. on August 9,
                    2005.</font></div>
                </td>
                <td align="left" valign="top" width="1%">&#160;</td>
              </tr>

          </table>
        </div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><br></div><br>
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            <div id="GLHDR" style="WIDTH: 100%" align="right">
            </div>
          </div>
        </div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>SIGNATURES</strong></font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant
          to the requirements of the Securities Exchange Act of 1934, as amended,
          the
          Registrant has duly caused this report to be signed on its behalf by the
          undersigned hereunto duly authorized. </font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Date:
          August 9, 2005</font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
        <div>
          <table cellpadding="0" cellspacing="0" width="100%">

              <tr>
                <td align="left" valign="top" width="72%">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">SIRNA
                    THERAPEUTICS, INC. </font></div>
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">(Registrant)
                    </font></div>
                </td>
              </tr>

          </table>
        </div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
        <div>
          <table cellpadding="0" cellspacing="0" width="100%">

              <tr>
                <td align="left" valign="top" width="7%" style="BORDER-BOTTOM: #ffffff solid">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">By:
                    </font></div>
                </td>
                <td valign="top" width="14%" style="BORDER-BOTTOM: #000000 thin solid">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">/s/
                    Howard W. Robin</font></div>
                </td>
                <td align="left" valign="top" width="50%" style="BORDER-BOTTOM: #ffffff solid">&#160;</td>
              </tr>
              <tr>
                <td align="left" valign="top" width="7%">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Name:
                    </font></div>
                </td>
                <td valign="top" width="14%">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Howard
                    W. Robin</font></div>
                </td>
                <td align="left" valign="top" width="50%">&#160;</td>
              </tr>
              <tr>
                <td align="left" valign="top" width="7%">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Title:
                    </font></div>
                </td>
                <td valign="top" width="14%">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">President
                    and Chief Executive Officer</font></div>
                </td>
                <td align="left" valign="top" width="50%">&#160;</td>
              </tr>

          </table>
        </div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div><br>
        <div id="PGBRK" style="MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt">
          <div id="FTR">
            <div id="GLFTR" style="WIDTH: 100%" align="left">
            </div>
          </div>
          <div id="PN" style="PAGE-BREAK-AFTER: always">
            <div style="WIDTH: 100%; TEXT-ALIGN: center">
            </div>
            <div style="WIDTH: 100%; TEXT-ALIGN: center">
              <hr style="COLOR: black" noshade size="2">
            </div>
          </div>
          <div id="HDR">
            <div id="GLHDR" style="WIDTH: 100%" align="right">
            </div>
          </div>
        </div><br>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><strong>EXHIBIT
          INDEX</strong></font></div>
        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="justify">&#160;</div>
        <div>
          <table cellpadding="0" cellspacing="0" width="100%">

              <tr>
                <td valign="top" width="8%">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Exhibit&#160;No.</u></font></div>
                </td>
                <td align="left" valign="top" width="1%">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
                </td>
                <td align="left" valign="top" width="57%">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><u>Description
                    of Exhibit</u></font></div>
                </td>
                <td align="left" valign="top" width="1%">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
                </td>
              </tr>
              <tr>
                <td valign="top" width="8%">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">99.1</font></div>
                </td>
                <td align="left" valign="top" width="1%">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
                </td>
                <td align="left" valign="top" width="57%">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Press
                    Release issued by Sirna Therapeutics, Inc. on August 9,
                    2005.</font></div>
                </td>
                <td align="left" valign="top" width="1%">
                  <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="left">&#160;</div>
                </td>
              </tr>

          </table>
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        <div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; LINE-HEIGHT: 1.25; MARGIN-RIGHT: 0pt" align="center">&#160;</div>
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{"company-data": {"conformed-name": "SIRNA THERAPEUTICS INC", "cik": "0000892112", "assigned-sic": "2834", "irs-number": "341697351", "state-of-incorporation": "CO", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-27914", "film-number": "051010348"}, "business-address": {"street1": "2950 WILDERNESS PLACE", "city": "BOULDER", "state": "CO", "zip": "80301", "phone": "3034496500"}, "mail-address": {"street1": "2950 WILDERNESS PLACE", "city": "BOULDER", "state": "CO", "zip": "80301"}, "former-company": {"former-conformed-name": "RIBOZYME PHARMACEUTICALS INC", "date-changed": "19960306"}}
Unassociated Document
UNITED
        STATES
SECURITIES
        AND EXCHANGE COMMISSION
Washington,
        D.C. 20549
FORM
        8-K
CURRENT
        REPORT
PURSUANT
        TO SECTION 13 OR 15(D) OF THE
SECURITIES
        EXCHANGE ACT OF 1934
Date
        of
        Report (Date of earliest event reported):
August 9, 2005
Sirna
        Therapeutics, Inc.
(Exact
        name of registrant as specified in its charter)
Delaware
0-27914
34-1697351
(State
                  or other jurisdiction
of
                  incorporation)
(Commission
                  File No.)
(I.R.S.
                  Employer
Identification
                  Number)
185
        Berry Street, Suite 6504
San
        Francisco, California 94107
(Address
        of principal executive offices)
Registrant's
        telephone number, including area code:
(415) 512-7624
N/A
(Former
        name or former address, if changed since last report)
Check
        the
        appropriate box below if the Form 8-K filing is intended to simultaneously
        satisfy the filing obligation of the registrant under any of the following
        provisions:
o
Written
        communications pursuant to Rule 425 under the Securities Act (17 CFR
        230.425)
x
Soliciting
        material pursuant to Rule 14a-12 under the Exchange Act (17 CFR
        240.14a-12)
o
Pre-commencement
        communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR
        240.14d-2(b))
o
Pre-commencement
        communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR
        240.13e-4(c))
ITEM 2.02
RESULTS
                    OF OPERATIONS AND FINANCIAL CONDITIONS
ITEM
                    7.01
REGULATION
                    FD DISCLOSURE
On
          Tuesday, August 9, 2005, Sirna Therapeutics, Inc. (the "Company") issued a press
          release announcing its financial results for the second quarter ended on
          June
          30, 2005. A copy of the press release is furnished herewith as Exhibit
          99.1 and
          is incorporated herein by reference.
Howard
          W.
          Robin, the Company's President and CEO, and the Company's senior management team
          will discuss these financial results as well as progress to date in the
          Company's clinical and preclinical programs during a conference call on Tuesday,
          August 9, 2005 at 4:30 p.m. EDT (2:30 p.m. MDT and 1:30 p.m. PDT). A live
          audio
          webcast of the call will be available at the Company's corporate web site
          at
          www.sirna.com. Participants should log on to the web site 15 minutes prior
          to
          the scheduled start time to download and install any necessary audio software.
          To access the live telephonic broadcast, domestic callers should dial (877)
          407-9039; international callers may dial (201) 689-8470. An audio webcast
          replay
          will be available on the Company's web site, www.sirna.com, for 30 days.
          Additionally, a telephonic replay of the call will be maintained through
          11:59
          p.m. EDT, Thursday, August 11, 2005. To access the replay, please dial
          (877)
          660-6853 from the U.S. or (201) 612-7415 when calling internationally,
          using
          account number 3055 and conference number 163090.
IMPORTANT
          ADDITIONAL INFORMATION
On
          July
          22, 2005, the Company filed with the Securities and Exchange Commission
          (the
"SEC") a definitive proxy statement in connection with a private placement.
          Investors and security holders of the Company are urged to read the proxy
          statement because it contains important information about the Company and
          the
          private placement. Investors and security holders of the Company may obtain
          free
          copies of the proxy statement at the SEC's website at http://www.sec.gov,
          at the
          Company's website at http://www.sirna.com or by writing to Sirna Therapeutics,
          Inc., 185 Berry Street, Suite 6504, San Francisco, California 94107, Attention:
          Investor Relations. The Company, its directors and the affiliates of a
          majority
          of its directors may be deemed to be participants in the solicitation of
          proxies
          with respect to the private placement. A description of the interests in
          the
          Company of its directors and such affiliates is set forth in the Company's proxy
          statement for its 2005 annual meeting of stockholders, filed with the SEC
          on May
          23, 2005 and the proxy statement in connection with the private placement,
          filed
          with the SEC on July 22, 2005.
The
          information contained in these Items 2.02 and 7.01, including Exhibit 99.1,
          is
          being furnished and shall not be deemed to be "filed" for purposes of Section
          18
          of the Securities Exchange Act of 1934, as amended (the "Exchange Act"),
          or
          otherwise subject to the liability of that section. The information contained
          in
          these Items 2.02 and 7.01, including Exhibit 99.1, shall not be incorporated
          by
          reference into any filing under the Securities Act of 1933, as amended,
          or the
          Exchange Act, whether made before or after the date hereof, except as shall
          be
          expressly set forth by specific reference in such filing.
ITEM 9.01
FINANCIAL
                    STATEMENTS AND EXHIBITS
(c)
          Exhibit
99.1
Press
                    Release issued by Sirna Therapeutics, Inc. on August 9,
                    2005.
SIGNATURES
Pursuant
          to the requirements of the Securities Exchange Act of 1934, as amended,
          the
          Registrant has duly caused this report to be signed on its behalf by the
          undersigned hereunto duly authorized.
Date:
          August 9, 2005
SIRNA
                    THERAPEUTICS, INC.
(Registrant)
By:
/s/
                    Howard W. Robin
Name:
Howard
                    W. Robin
Title:
President
                    and Chief Executive Officer
EXHIBIT
          INDEX
Exhibit No.
Description
                    of Exhibit
99.1
Press
                    Release issued by Sirna Therapeutics, Inc. on August 9,
                    2005.