Ixazomib -Daratumumab Without Dexamethasone (IDara) in Elderly Relapse Refractory Multiple Myeloma

"Daratumumab will be administrated every week for the first 2 cycles. For cycle 3 to 6, it will be administrated every two weeks at day 1 and day 15. From cycle 7 until progression Daratumumab will be administrated every 4 weeks.~Ixazomib will be administrated every week three weeks on one week off at D1, D8 and D15 on a 28-d cycle basis.~Dexamethasone will not be given except one series of 4 days of dexamethasone, 20 mg/day or a maximum of 80 mg, for emergencies and complications at initiation of treatment."