Odds ratios and 95 % confidence intervals for cancer risk by MLH1 -93 polymorphism status , and stratified by previous exposure to methylating chemotherapy , were calculated using unconditional logistic regression .
O O O O O O O O B-DiseaseOrPhenotypicFeature O O B-GeneOrGeneProduct O O O O O O O O O O O O O O O O O O O O