The association between survivin −31G>C polymorphism and susceptibility to sporadic colorectal cancer in a Southern Chinese population

ABSTRACT

Background: The case–control study aimed to investigate the association between the −31G>C polymorphism in the promoter of survivin gene and the susceptibility to sporadic colorectal cancer (CRC) in a Southern Chinese population. Materials and Methods: The study was carried out on 711 healthy controls and 702 CRC cases of a Southern Chinese population. Survivin gene −31G>C genotypes were determined by polymerase chain reaction-restriction fragment length polymorphism. The association between CRC risk and −31G>C genetic polymorphism was estimated using an unconditional logistic regression model. Results: The number of CC genotype carried in CRC patients was much higher than those of controls (P < 0.001). Compared with CC genotypes, GC, GG genotypes and −31G wild-type genotypes (i.e., GC + GG) had a significantly decreased risk of CRC (P < 0.001). In addition, survivin −31G wild-type genotypes were not associated with decreased risk of sporadic CRC patients with body mass index (BMI) ≥28.0 kg/m2, family cancer history, and premenopausal. Conclusion: Survivin −31G>C polymorphism is associated with sporadic CRC risk in the Southern Chinese population. The −31G wild-type genotypes and GC, GG genotypes are the independent protective factors against sporadic CRC excluding those with a BMI ≥28.0 kg/m2, family cancer history, and premenopausal