XRCC1 and cervical cancer: Association of genotypes of CYP1A1 T>C rs4646903, CYP1A1 A>G rs1048943, CYP2E1 T>A rs6413432, RAD51 G>C rs1801320, XRCC1 G>A rs25487, XRCC2 G>A rs3218536 and XRCC3 C>T rs861539 polymorphisms and survival after treatment (CRT) for cervical cancer.