However, when combined the GSTM1 null genotype and GSTP1 A131G polymorphism (OR = 1.3867, 95% CI = 0.9763–1.9697, P = 0.0679, I2 = 67.33%), or the three genotypes (OR = 1.6903, 95% CI = 0.6823–4.1874, P = 0.2568, I2 = 76.3%), no dramatic PCa risks were obtained. The gene discussed is GSTP1; the disease is posterior cortical atrophy.