RESUMO
Many studies have demonstrated that Vitamin D has an important role in cell growth and proliferation and vitamin D receptor polymorphism has significant relationship with colorectal cancer [CRC]. The aim of this study was to assess the incidence of VDR rs 2238136 polymorphism in Iranian population and to investigate the relationship between this single nucleotide polymorphism [SNP] and increased risk of CRC. In this case-control study, genotyping of vitamin D receptor gene polymorphism [VDR rs2238136] was determined in a series of 112 colorectal cancer patients and 112 controls by using polymerase chain reaction and restriction fragment length polymorphism genotyping assays [PCR-RFLP]. Statistical analysis was done through SPSS 16. VDR polymorphism [rs 2238136] had no significant relationship with CRC risk. The result of statistical analysis for the genotype AG compared with GG was OR=0. 59, CI=0.33-1.03 and for AA versus GG was OR=0.8, Ct=0.29-2.17. Incidence of mutant allele in patients and controls did not show significant difference [OR=0.74, CI=0.49 -1.13]. These findings suggest that VDR [rs 2238136] is not associated with increased risk of CRC. Moreover age, sex and smoking are not predisposing factors for increased risk of CRC