Successful management of hemodialysis-dependent refractory myeloma with modified daratumumab, bortezomib and dexamethasone regimen.

A 71-year-old petite Japanese woman was diagnosed with IgG λ-type multiple myeloma with acute kidney injury, severe anemia, and a pathological rib fracture. Emergent hemodialysis was initiated combined with chemotherapy including bortezomib, lenalidomide, and pomalidomide, but myeloma had become refractory due to the treatments. Therefore, a combination therapy with weekly daratumumab (16 mg/kg), bortezomib (0.7 mg/m2), and dexamethasone was started. Daratumumab was administered on a non-dialysis day with a reduced infusion speed to avoid acute water load. No infusion-related adverse events were observed throughout the treatment. Daratumumab and bortezomib were administrated weekly for three times in the first cycle and a hematological very good partial response was achieved. Then, the treatment schedule was reduced to once every three weeks from the 2nd cycle, the very good partial response had been maintained. Fourteen months after the initiation of maintenance hemodialysis, the patient was able to reduce dialysis frequency due to improvement of renal function. A modified daratumumab, bortezomib and dexamethasone regimen could be a valuable treatment option for dialysis-dependent myeloma patients.