Huang et al. [48] analyzed eight studies of GSTM1, eight studies of GSTT1, three studies of GSTM1 gene polymorphism and clinical TNM stages, and four studies on GSTM1 and GSTT1 gene polymorphism and clinical TNM stages, and indicated that GSTM1 and GSTT1 gene polymorphisms were not markedly associated with RCC susceptibility in a recessive model. This evidence concerns the gene GSTM1 and renal cell carcinoma.