CD38 and neutropenia: There was a significant increase in hematological adverse events, such as neutropenia (RR 1.41; 95% CI 1.26–1.58; p < 0.01) and thrombocytopenia (RR 1.14; 95% CI 1.02–1.27; p = 0.02), in the group treated with anti-CD38 monoclonal antibody.