Role of KAI1/CD82 polymorphisms in colon cancer risk in Han Chinese population

The aim of this study is to investigate the associations between KAI1/CD82 gene polymorphisms and colorectal cancer (CRC)-risk predisposition. We undertook a case–control study to analyze two KAI1/CD82 polymorphisms (exon 3 −29166 C>T and exon 9 −52840 C>A) in an Han Chinese population, by extraction of genomic DNA from the peripheral blood of 356 patients with CRC and 378 control participants, and performed KAI1/CD82 genotyping using DNA sequencing. The obtained results indicated that overall, no statistically significant association was observed in exon 9 (−52840 C>A). Nevertheless, exon 3 (−29166 C>T) genotype was at increased risk of CRC (P = 0.006; odds ratio = 1.299, CI 95 % 1.058–1.549). Furthermore, −29166 T allele CRCs were more significantly common in patients with tumor size of >4 cm than C allele CRC and in cases of poor differentiation and advanced pathological stage. These findings led us to conclude that polymorphism in exon 3 (−29166 C>T) was observed to be associated with susceptibility of CRC. However, exon 9 (−52840 C>A) polymorphism showed no correlation to CRC susceptibility. Nevertheless, further investigation with a larger sample size is needed to support our results.