XRCC1 and cholangiocarcinoma: Pacetti et al. investigated the association of polymorphisms of ERCC1-C118T, ERCC2/XPD-Asp312Asn(rs1799793), ERCC2/XPD Lys751Gln(rs13181) and XRCC1-Arg399Gln(rs25487) with CCA [98].