In another study, the stratified analysis by ethnicity demonstrated significant risks for GSTM1 null genotypes and head and neck cancer among Asians (OR = 1.39, 95% CI = 1.27-1.53; P = 0.000), but not in Caucasians (OR = 0.99, 95% CI = 0.83-1.18; P = 0.677), thus corroborating our results (Li et al., 2018). The gene discussed is GSTM1; the disease is head and neck cancer.