XRCC1 and cancer: Among the established polymorphisms of the DNA repair genes, the X-ray cross-complementing group 1 (XRCC1) and 8 Oxo guanine DNA-glycosylase 1 (OGG1) polymorphisms have been frequently studied as potentially related with susceptibility to the incidence of several cancers (Simonelli et al., 2012; Nissar et al., 2014).