APEX1 and colorectal carcinoma: We therefore investigated whether MLH1 rs1799977, MLH1 rs1800734, APEX1 rs1130409, APEX1 rs1760944, MUTYH rs3219489, OGG1 rs1052133, NUDT1 rs1799832, XRCC5 rs828907, XPA rs1800975, and ERCC2 rs13181 were associated with CRC.