An association between CYP17 MspA1 or CYP19 Arg264Cys polymorphisms and breast cancer were not observed (OR = 1.02, 95% CI 0.72-1.44 for CYP17genotypes TC/CC and OR = 0.85, 95% CI 0.48-1.49 for CYP19genotypes CT/TT). However, a statistically significant increased risk estimate was identified in womenwho had at least one NQO1 polymorphic allele (T), OR= 1.96, 95% CI 1.13-3.40 following adjustment for selected confounders.