NQO1 and colorectal cancer: A previous meta-analysis by Chao et al. [62] found an association between the NQO1 609T allele and an increased risk for colorectal cancer (CT/TT vs. CC: OR = 1.18, 95% CI: 1.02 – 1.35) among 1637 cases and 1854 controls in the Caucasian population, and this association remained statistically significant in this expanded meta-analysis that had included additional subjects (2410 cases and 2676 controls in the Caucasian population).