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Background  The objective of the present study is to comprehensively evaluate the impact of the rs1800975 A/G polymorphism within the human xeroderma pigmentosum group A ( XPA ) gene on susceptibility to overall cancer by performing an integrative analysis of the current evidence.    Methods  We retrieved possible relevant publications from a total of six electronic databases (updated to April 2020) and selected eligible case–control studies for pooled assessment.  P -values of association and odds ratio (OR) were calculated for the assessment of association effect. We also performed Begg’s test and Egger’s test, sensitivity analysis, false-positive report probability (FPRP) analysis, trial sequential analysis (TSA), and expression/splicing quantitative trait loci (eQTL/sQTL) analyses.    Results  In total, 71 case–control studies with 19,257 cases and 30,208 controls from 52 publications were included for pooling analysis. We observed an enhanced overall cancer susceptibility in cancer cases compared with negative controls in the Caucasian subgroup analysis for the genetic models of allelic G vs. A, carrier G vs. A, homozygotic GG vs AA, heterozygotic AG vs. AA, dominant AG + GG vs. AA and recessive GG vs. AA + AG ( P  < 0.05, OR > 1). A similar positive conclusion was also detected in the “skin cancer” or “skin basal cell carcinoma (BCC)” subgroup analysis of the Caucasian population. Our FPRP analysis and TSA results further confirmed the robustness of the conclusion. However, our eQTL/sQTL data did not support the strong links of rs1800975 with the gene expression or splicing changes of  XPA  in the skin tissue. In addition, even though we observed a decreased risk of lung cancer under the homozygotic, heterozygotic and dominant models ( P  < 0.05, OR < 1) and an enhanced risk of colorectal cancer under the allelic, homozygotic, heterozygotic, dominant ( P  < 0.05, OR > 1), our data from FPRP analysis and another pooling analysis with only the population-based controls in the Caucasian population did not support the strong links between the  XPA  rs1800975 A/G polymorphism and the risk of lung or colorectal cancer.    Conclusions  Our findings provide evidence of the close relationship between the  XPA  rs1800975 A/G polymorphism and susceptibility to skin cancer in the Caucasian population. The potential effect of  XPA  rs1800975 on the risk of developing lung or colorectal cancer still merits the enrollment of larger well-scaled studies.

Association of human XPA rs1800975 polymorphism and cancer susceptibility: an integrative analysis of 71 case–control studies