In addition, the GSTM1 null genotype was associated with a significantly increased leukemia risk in Asians (OR = 1.48, 95% CI: 1.30–1.68), Caucasians (OR = 1.14, 95% CI: 1.03–1.26), and Indians (OR = 1.37, 95% CI: 1.01–1.87). Here, GSTM1 is linked to leukemia.