CD38 and B-cell chronic lymphocytic leukemia: Overexpression of CD38 has been noted in multiple myeloma (MM),97 chronic lymphocytic leukemia (CLL),98, 99 acute lymphoblastic leukemia (ALL),100 Waldenstrom's macroglobulinemia,101 B‐cell non‐Hodgkin lymphoma,102 and other malignancies, highlighting its clinical significance.