A successful control of cardiac amyloidosis by idecabtagene vicleucel in a patient with relapsed and refractory multiple myeloma: a case report and literature review.

A 50-year-old Japanese man with penta-drug refractory multiple myeloma (MM) was found to have stage IIIa cardiac immunoglobulin light-chain amyloidosis before idecabtagene vicleucel (ide-cel) therapy. Ide-cel therapy was started after careful consideration and hospital ethics committee approval. Grade 3 cytokine release syndrome and atrial flutter occurred in the acute phase after ide-cel infusion, but these were well-tolerated with supportive care in the intensive care unit. The patient achieved stringent complete response at day 60 and cardiac response at 9 months after ide-cel infusion with the addition of catheter ablation for sustained atrial flutter on day 133. He has maintained both hematological and cardiac remission for over 1 year since ide-cel therapy. This case highlights the effectiveness of ide-cel for disease control in heavily pretreated MM with cardiac amyloidosis.