XRCC1 and pancreatic adenocarcinoma: In the present study, we found that the T453 site of XRCC1 protein exhibited higher phosphorylation levels in the breast, colon, LUAD, UCEC, and PAAD and that the expression status of XRCC1 phosphorylated proteins (S241, S266, S268, S447, S461 S475, and T453 sites) in certain tumor tissues and normal tissues was somewhat of a difference.