The IL-17A rs2275913 polymorphism is associated with colorectal cancer risk

Associations of IL-4, IL-4R, IL-17A, and IL-17F Polymorphisms with Colorectal Cancer Risk: A Meta-Analysis, Meta-Regression, and Trial Sequential Analysis

Both interleukin (IL)-4 and IL-17 polymorphisms may be involved in the pathogenesis and progression of colorectal cancer (CRC). Herein, we designed a meta-analysis to assess the associations between IL-4, IL-4R, IL-17A, and IL-17F polymorphisms and CRC risk. Scopus, Web of Science, Cochrane Library, and PubMed databases were searched to retrieve articles published until October 21, 2021. We used crude odds ratio (OR) and 95% confidence interval assessing the association of the polymorphisms and CRC risk in 5 genetic models. Trial sequential analysis for the primary analyses was used to control random errors. Twenty-three studies (8: IL-4 rs2243250, 4: IL-4R rs1801275, 5: IL-17A rs2275913, and 6: IL-17F rs763780) were involved in the meta-analysis. The pooled OR (P-value) for the association between IL-4 rs2243250 polymorphism and the CRC risk was 1.11 (0.08), 1.27 (0.12), 1.07 (0.37), 1.09 (0.17), and 1.22 (0.12), for IL-4R rs1801275 polymorphism was 0.71 (0.18), 1.05 (0.76), 0.86 (0.37), 0.87 (0.41), and 0.69 (0.39), for IL-17A rs2275913 polymorphism was 1.83 (0.0003), 1.73 (0.06), 1.47 (<0.001), 1.61 (0.001), and 1.42 (0.15), and for IL-17F rs763780 polymorphism was 1.07 (0.48), 5.33 (0.02), 1.08 (0.49), 1.08 (0.47), and 8.42 (0.002) in allelic, homozygous, heterozygous, recessive, and dominant models, respectively. The G allele and GA genotype of IL-17A rs2275913 polymorphism and the CC genotype of IL-17F rs763780 polymorphism had an elevated risk in CRC cases. The ethnicity and genotyping method, sample size, control, and publication year were effective factors on the pooled results.

Associations of IL-17A -197G/A and IL-17F 7488T/C polymorphisms with cancer risk in asians: An updated meta-analysis from 43 studies

OBJECTIVE

Numerous epidemiological studies have been published to elucidate the potential associations of IL-17A -197G/A (rs2275913) and IL-17F 7488T/C (rs763780) with cancer risk in Asians. Nevertheless, the results from different studies remain controversial. To identify the roles of the two polymorphisms in cancer risk, we performed this current meta-analysis.

METHODS

The available literature was derived from five databases, covering relevant articles updated through February 17, 2021. Five different analysis models with corresponding odds ratios (ORs) and 95% confidence intervals (CIs) were applied to appraise the gene-disease correlation.

RESULTS

In total, 43 case-control studies with 31,237 subjects were enrolled. Overall analyses indicated that there was significantly increased cancer risk led by IL-17A -197G/A under the five analysis models. A similar tendency was also identified in the subgroup analysis of cancer type, especially for gastric cancer, cervical cancer, colorectal cancer, and oral carcinoma. As for IL-17F 7488T/C, we revealed that patients who carried this variant had a higher cancer risk in the recessive model among the overall analyses, as well as subgroup analyses of cervical cancer or oral carcinoma.

CONCLUSIONS

In summary, our work confirmed that IL-17A -197G/A acted as a risk factor for diverse cancer types and that IL-17F 7488T/C might be involved in cervical cancer and oral carcinoma.