MGMT and non-Hodgkin lymphoma: For the DNA repair gene polymorphisms, the XRCC1 399 GA, OGG1 326 GG, BRCA1 871 TT, WRN 787 TT, and MGMT 115 CT genotypes were associated with the risk for NHL, as were the ABCB1 1236 CC and 3435 TT genotypes.