XRCC1 and non-Hodgkin lymphoma: Among the DNA repair genes, the polymorphism genotypes XRCC1 399 GA and WRN 787 TT were associated with a decreased risk for NHL (odds ratio (OR)XRCC1 GA = 0.80, p = 0.02; ORWRN 787 TT = 0.68, p = 0.01).