Daratumumab, Bortezomib, Cyclophosphamide, and Dexamethasone Therapy for Patients with MIDD

"Patient will receive Dara-CyBorD (Daratumumab, Bortezomib, Cyclophosphamide, Dexamethasone) for at least 6 cycles, and then Daratumumab maintainance.~Drug: Daratumumab: 16mg/kg IV dose OR 1800 mg subcutaneously Drug: Cyclophosphamide: 300 mg/m\^2 as an oral or IV dose Drug: Bortezomib: 1.3 mg/m\^2 as an subcutaneous (SC) injection. Drug: Dexamethasone: 20-40mg Patients will receive the above drugs (Dara-CyBorD) on Days 1, 8, 15, 22 in every 28-day cycle for a maximum of 6 cycles. Daratumumab will be administered weekly for the first 8 weeks (2 cycles), then every 2 weeks for 4 cycles (cycles 3-6), and then every 4 weeks until progression of disease or subsequent therapy for a maximum of 1 years.~Note: If patients achieve less than hematologic VGPR by cycle 3 or less than PR by cycle 2, treatment plan will be allowed to discontinued, according to treatment principle in systemic light chain amyloidosis."