Association between FAS gene-670 A/G and-1377 G/A polymorphisms and the risk of autoimmune diseases: a meta-analysis

Objectives: FAS plays a critical role in the extrinsic apoptosis pathway in autoimmune diseases. Previous studies investigating the association between FAS gene -670 A/G and -1377 G/A polymorphisms and the risk of autoimmune diseases reported controversial results. We performed the meta-analysis to evaluate the possible association. Methods: Relevant studies were identified by searching the PubMed, Embase, CNKI, and Wanfang databases up to December 2018. Odds ratios (ORs) and corresponding 95% confidence intervals (CIs) were calculated to determine the association. Results: A total of 43 articles including 67 studies (52 studies for FAS -670 A/G and 15 studies for -1377 G/A) were included in the meta-analysis. Our meta-analysis showed that the FAS -670 A/G polymorphism was associated with the risk of autoimmune diseases (GG vs. GA: OR = 1.079, 95% CI = 1.004-1.160, P=0.038), especially in Caucasians (GG vs. GA: OR = 1.12, 95% CI = 1.03-1.23, P=0.012), Asians (G vs. A: OR = 0.89, 95% CI = 0.83-0.96, P=0.002), systemic lupus erythematosus (SLE) (G vs. A: OR = 0.85, 95% CI = 0.77-0.94, P=0.001), multiple sclerosis (MS) (GG+GA vs. AA: OR = 0.83, 95% CI = 0.70-0.99, P=0.043), systemic sclerosis (SSc) (GG vs. GA: OR = 1.20, 95% CI = 1.07-1.36, P=0.003) and Hashimoto's thyroiditis (HT) (G vs. A: OR = 1.45, 95% CI = 1.10-1.90, P=0.008); the FAS -1377 G/A polymorphism was associated with the risk of autoimmune diseases (A vs. G: OR = 1.11, 95% CI = 1.03-1.20, P=0.008), especially in Asians (A vs. G: OR = 1.15, 95% CI = 1.05-1.25, P=0.002) and high quality studies (A vs. G: OR = 1.14, 95% CI = 1.05-1.24, P=0.002). Conclusion: This meta-analysis demonstrated that the FAS -670A/G and -1377 G/A polymorphisms were associated with the risk of autoimmune diseases.