Abstract
An 81-year-old Japanese woman was diagnosed with Bence Jones protein κ-type multiple myeloma with acute kidney injury and severe anemia, complicated by congestive heart failure with triple vessel coronary artery disease. Her serum κ-free light-chain (FLC) level was 49,400 mg/L and κ/λ ratio was extremely high at 2373. Her kidney function deteriorated rapidly and required hemodialysis before initiating chemotherapy. A combination therapy of daratumumab (16 mg/kg), lenalidomide, and dexamethasone was initiated as a first-line treatment; the infusion rate of daratumumab was adjusted to reduce the heart load. The level of κ-FLC was rapidly reduced by 75% in only one week and by 99% after three weeks. Furthermore, she was dialysis-independent after the fourth dose of daratumumab. We report the first case of untreated patient with myeloma who had been successfully treated with daratumumab, lenalidomide, and dexamethasone therapy even in dialysis requiring state. Daratumumab may benefit patients with acute kidney injury caused by multiple myeloma, owing to the immediate need of FLC level reduction. Daratumumab and lenalidomide combination therapy could be a valuable treatment option for patients requiring dialysis when bortezomib may be hesitate to use due to severe heart disease.