GSTM1-null genotype was not associated with the clinical TNM stages of RCC in the overall population, Caucasians, Asians, or hospital-based controls (overall population: OR = 0.72, 95% CI: 0.30–1.70, P = 0.45; Caucasians: OR = 1.68, 95% CI: 0.88–3.24, P = 0.12; Asians: OR = 0.55, 95% CI: 0.11–2.70, P = 0.46; hospital-based controls: OR = 1.32, 95% CI: 0.95–1.83, P = 0.10; Table 4). The gene discussed is GSTM1; the disease is renal cell carcinoma.