The GSTM1 null genotype was significantly associated with an increased risk of gallbladder cancer in Bolivians (Sakai et al., 2016), though no associations were observed in Japanese, Hungarians, and Chileans (Tsuchiya et al., 2007; Kimura et al., 2008; Tsuchiya et al., 2010). Here, GSTM1 is linked to gallbladder cancer.