The GSTM1-null genotype was found to be not associated with RCC susceptibility in the collective populations, Asians and Caucasians, hospital-based controls, or population-based controls (collective populations: OR = 1.00, 95% CI: 0.92–1.09, P = 0.91; Caucasians: OR = 1.02, 95% CI: 0.92–1.12, P = 0.72; Asians: OR = 0.95, 95% CI: 0.78–1.17, P = 0.65; hospital-based controls: OR = 1.01, 95% CI: 0.92–1.11, P = 0.85; population-based controls: OR = 0.87, 95% CI: 0.57–1.33, P = 0.52; Fig. 2 for the overall population; Table 4). Here, GSTM1 is linked to renal cell carcinoma.