In Table 2, the results suggested that GSTM1 null genotype did increase the risk of prostate cancer in Asian population (OR = 1.403; 95%CI = 1.088 – 1.808), with statistically significant heterogeneity among studies (I2 = 60.7%; p value = 0.013). This evidence concerns the gene GSTM1 and Familial prostate cancer.