With regard to colorectal cancer, Li et al. (2013) performed a relevant meta-analysis including seven case-control studies (3,173 cases/3,323 controls) (Welfare et al., 1999; Sachse et al., 2002; Landi et al., 2005; Kury et al., 2008; Sainz et al., 2011; Wang et al., 2011; Ebrahimkhani et al., 2012) in 2013 and reported a negative association between GSTP1 rs1138272 and colorectal cancer risk (Li et al., 2013). Here, GSTP1 is linked to colorectal cancer.