MDC1 and Fanconi anemia complementation group C: These included intronic SNPs in the genes BRIP1 (BRCA1 interacting protein C-terminal helicase 1), FANCC (Fanconi anemia complementation group C), MDC1 (mediator of DNA damage checkpoint 1), and XRCC4 (X-ray repair cross-complementing protein 4) as well as in TP53BP1 (TP53-binding protein 1).