Investigation of vascular invasion and genetic polymorphisms of DPD IVS14+1 G>A, UGT1A1 3156 G>A, and UGT1A1 28 tandem repeats in colorectal cancer patients in Taiwan

In the present study, multiple chemotherapeutic agent-related genetic polymorphisms, including dihydropyrimidine dehydrogenase (DPD) IVS14+1 G>A, UGT1A1 3156 G>A, and UDP-glucuronosyltransferase (UGT)1A1 28 tandem repeats, were analyzed in patients with colorectal cancer and studied in correlation with the clinical features of those patients. The genotypes from 273 patients with stages I–IV colorectal cancer who underwent operations were determined by means of polymerase chain reaction-restriction fragment length polymorphism. The results showed that the genotype distribution of DPD GG, UGT1A1 3156 GG, and UGT1A1 28 tandem repeats 5/6 or 6/6 in Taiwanese subjects were 98.4%, 82.2%, and 80.6%, respectively. After analysis of the relationship between the genotypes and clinicopathological data of the patients, a significant correlation was observed between vascular invasion in patients with genetic polymorphisms ofDPDGG, UGT1A13156GG, and UGT1A1 28 repeat 5/6 or 6/6 (OR: 2.236, p = 0.015). There was a statistical correlation between vascular invasion and tumor invasion, lymph node metastasis, cancer stage, differentiation, perineural invasion, and survival (all p < 0.05). The results of the present study highly suggest that DPDGG, UGT1A13156GG, and UGT1A1 28 repeat 5/6 or 6/6 genotypes and vascular invasion could be prognostic factors for Taiwanese patients with colorectal cancer.