<b><i>Background:</i></b> Colorectal cancer (CRC) is one of the common malignant tumors, with high mortality and poor prognosis. Our study aimed to determine the association between the long noncoding RNA (LncRNA) <i>C5orf66</i> polymorphism and CRC risk in southern Chinese Han population. <b><i>Method:</i></b> Using the experimental design of “case-control” study (512 cases and 513 controls), we selected 4 candidate single-nucleotide polymorphisms (SNPs) of <i>C5orf66</i>. All candidate SNPs were genotyped by Agena MassARRAY. Logistic regression was used to analyze the association between SNPs and CRC risk. Then, we used false-positive report probability analysis to detect whether the significant result is just a chance or noteworthy observation. Multi-factor dimensionality reduction was used to analyze the interaction of “SNP-SNP” in CRC risk. <b><i>Results:</i></b> Our results showed that <i>C5orf66</i> SNPs rs4976270 (odds ratio [OR] = 1.69, <i>p</i> = 0.021) and rs639933 (OR = 1.67, <i>p</i> = 0.024) were, respectively, associated with increasing CRC risk in the southern Chinese Han population. Stratified analysis showed that rs4976270 and rs639933 were significantly associated with an increased risk of CRC in subgroups (>60 years, body mass index ≤24 and drinking) under multiple genetic models. In addition, rs254563 and rs647161 also had potential association with CRC risk in subgroups (BMI ≤24 and drinking). Finally, haplotype analysis results showed that haplotype “TA” was significantly associated with increased CRC risk (OR = 1.21, confidence interval = 1.47–2.02, <i>p</i> = 0.043). <b><i>Conclusion:</i></b> Our study provides a new idea for the risk assessment of CRC. LncRNA C5orf66 SNPs have a certain association with CRC risk in the southern Chinese Han population.
Association of CD44 gene rs187115 polymorphism with colorectal cancer risk and prognosis in Chinese Han population: a case-control study
