ERCC2 and skin basal cell carcinoma: Similarly, for the Asp312Asn polymorphism in XPD, genotypes containing the variant allele were less frequent in both case groups, and this was of borderline significance (BCC: OR = 0.8, 95% CI, 0.7–1.0; SCC: OR = 0.8, 95% CI, 0.6–1.0).