Polymorphism / Colorectal cancer / Iran / Humans / Female / Male / Polymerase Chain Reaction / DNA methylation / Asian-Pacific Region / Middle Aged / Genotype / Adult / Public health systems and services research / Amino Acid Substitution Rates / Genetic Susceptibility / Allele Frequency / Case Control Studies / Colorectal Neoplasms / Male / Polymerase Chain Reaction / DNA methylation / Asian-Pacific Region / Middle Aged / Genotype / Adult / Public health systems and services research / Amino Acid Substitution Rates / Genetic Susceptibility / Allele Frequency / Case Control Studies / Colorectal Neoplasms