DLBCL: diffuse large B-cell lymphoma; CBC: complete blood count; Dx: diagnosis; Hx: history; DM: diabetes mellitus; HTN: hypertension; CKD: chronic kidney disease; ANC: absolute neutrophil count; Hb: hemoglobin; PLT: platelets; LDH: lactate dehydrogenase; CR: complete response; PR: partial response; SD: stable disease; PD: progressive disease. The gene discussed is GSTM1; the disease is diffuse large B-cell lymphoma.