Functional Foxp3 polymorphisms and the susceptibility to cancer: An update meta-analysis

BACKGROUND: Forkhead box P3 (Foxp3) plays important roles in the development and pathogensis of cancer. To investigate the association of 3 polymorphisms of Foxp3 (rs3761548, rs 3761549 and rs2280883) and cancer risk, an updated meta-analysis was performed. METHODS: Around 11 studies including 4344 cancer patients and 4665 healthy controls were selected for this meta-analysis. There were nine studies with 3783 cases and 4096 controls for rs3761548, 4 studies with 1669 cases and 1613 controls for rs3761549 and 4 studies with 1821 cases and 1799 controls for rs2280883. Odds radios (ORs) and 95% confidence intervals (CIs) were used to evaluate the cancer risk. RESULTS: Meta-analysis showed that rs3761548 was associated with an increased cancer risk in the overall population under the recessive model (AA vs CA + CC: OR = 1.45, 95%CI = 1.03–2.02, P = .03). No association was found between rs3761549, rs2280883 polymorphisms, and cancer susceptibility in the overall population. Nonetheless, in the genotyping methods subgroup analysis of rs2280883, a lower risk of cancer was found in studies using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) under the allelic model (C vs T: OR = 0.70, 95%CI = 0.52–0.95, P = .02), heterozygote model (TC vs TT: OR = 0.60, 95%CI = 0.41–0.87, P = .008) and dominant model (CC + TC vs TT: OR = 0.63, 95%CI = 0.45–0.90, P = .01). In the subgroup analysis by cancer types showed C allele or TC carriers were insusceptible to cancer under 3 genetic models (C vs T: OR = 0.78, 95%CI = 0.64–0.95, P = .01; TC vs TT: OR = 0.50, 95%CI = 0.32–0.79, P = .003; CC + TC vs TT: OR = 0.64, 95%CI = 0.51–0.82, P < .001). CONCLUSION: Our results suggest that rs3761548 polymorphism is associated with cancer risk.