BCL2 and colorectal cancer: For example, a study of MTHFR polymorphism genotypes in colorectal cancer patients reported that the frequency of methylated Bcl-2 promoter was significantly higher in individuals with CC genotype than that of those with CT and TT genotypes, and a significant difference of C and T alleles distribution were observed between patients with methylated and unmethylated Bcl-2 promoter35.