TNFRSF9 and Waldenstrom macroglobulinemia: Next, we examined CD137 induction on various types of malignant B cells derived from patients with B-cell acute lymphoblastic leukemia (ALL; n = 7), CLL (n = 14), diffuse large B-cell lymphoma (DLBCL; n = 3), Waldenström macroglobulinemia (WM; n = 3), and FL (n = 6).