A Deletion Polymorphism in Glutathione-S-Transferase Mu (GSTM1) and/or Theta (GSTT1) Is Associated with an Increased Risk of Toxicity after Autologous Blood and Marrow Transplantation

Abstract

Toxicity after blood and marrow transplantation (BMT) has interindividual variability that may be explained by common genetic polymorphisms in critical pathways. The glutathione- S-transferase (GST) isoenzymes detoxify the reactive oxygen species generated by chemotherapy agents and radiation. We investigated whether deletion polymorphisms in 2 GST genes (. GSTM1 and GSTT1) were associated with toxicity after autologous or allogeneic BMT. The study population was selected from 699 consecutive BMT patients from 2 centers in Buffalo, NY, and Moscow, Russia, of whom 321 (203 autologous, 118 allogeneic BMT) had available banked samples and amplifiable DNA. Fifty percent of patients were homozygous null for GSTM1, which did not vary by center; however, the GSTT1 homozygous null deletion polymorphism occurred more frequently in patients treated in Moscow (38% versus 18%, P