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Daratumumab for Refractory IgD Multiple Myeloma with Lung Cancer and Persistent Thrombocytopenia: a Case Report by Zhihui Wang, Hong Deng, Liang Zhang, Yaxing Dai, Xianglong Li, Xiaojing Lin, Jin Wei, Xingli Zou

Background: Immunoglobulin D multiple myeloma (IgD-MM) is a rare but aggressive disease. The safety and effectiveness of anti-CD38 monoclonal antibody (daratumumab) have not been known in either IgD-MM or MM complicated with secondary neoplasm.
Methods: A fragile IgD-MM patient had an aggressively relapsed disease concurrent with lung cancer and severe thrombocytopenia, which led to a dilemma for management. After a failure of ixazomib-based chemotherapy, a salvage therapy with daratumumab unexpectedly induced complete remission and platelet recovery, and the patient successfully proceeded to lung cancer surgery.
Conclusions: Our case indicates daratumumab is both safe and effective for refractory IgD-MM with severe complications.

DOI: 10.7754/Clin.Lab.2021.210405