GSTM1 and diffuse large B-cell lymphoma: Unfortunately, in September 2021, the patient experienced a relapse of PBM-DLBCL, with bone marrow cytology showing 8% of lymphoma cells (Fig. 3C), CT scan revealing no bone lesions, and laboratory tests indicating a WBC count of 2.2 × 109/L, RBC count of 3.31 × 1012/L, Hb level of 92 g/L, platelet count of 154 × 109/L, ESR of 80 mm/h, LDH level of 396 U/L, ALP level of 275 U/L, and β2-M level of 1.7 mg/L.