In fact, we showed that there is a significant association between the late stage (TNM III/IV) of colorectal cancer, the chemotherapy (p = 0,001 RR 7 (1,81–27,07)) and radiotherapy (p = 0,0003 RR 8,36 (2,11–33,00)) in patients with AG/GG genotypes of IL17A gene (Table 5). This evidence concerns the gene IL17A and colorectal cancer.