Patients will receive induction treatment, which will consist: arm A (Isatuximab-VRD + ASCT) or arm B (VRD extended + ASCT plus ERI) or arm C (Isatuximab-VID + ASCT). After ASTC, patients will start consolidation which will be 2 cycles of similar treatment to induction.~Continuous treatment will follow after consolidation and patients will receive:~arm A: Lenalidomide and monthly Isatuximab until progression, unacceptable toxicity, patient withdrawal, loss to follow up or death. During continuous treatment, dexamethasone 40 mg is used as a standardized premedication for Isatuximab.~arm B: after 6 cycles of induction VRD, ASCT and two consolidation VRDs, treatment continues with 10 additional cycles of VRD. During the extension cycles, VRD changes the bortezomib and dexamethasone regimen. In these10 cycles, both bortezomib and dexamethasone will be administered, at the same doses as the previous ones, but on a weekly schedule, on days 1, 8, 15 and 22 of each cycle. The lenalidomide regimen remains unchanged.~arm C: Iberdomide and monthly Isatuximab until progression, unacceptable toxicity, patient withdrawal, loss to follow up or death. During continuous treatment, dexamethasone 40 mg is used as a standardized premedication for Isatuximab.~The primary objective is to compare the efficacy of extended VRD + ASCT plus ERI (Arm B) vs. Isatuximab-VRD + ASCT (Arm A) in terms of proportion of patients who are MRD-negative by next generation flow cytometry (NGF) after 18 cycles + ASCT.~The primary endpoint, the MRD rate, takes as a reference the evaluation after the last extended VRD cycle, this is: 6 cycles for induction, 6 months for transplantation, 2 cycles for consolidation and 10 cycles until completing the 18 cycles of VRD, (in total about 24 months). For this reason,the primary endpoint in Arms A and C are established after a similar treatment time, which includes 4 cycles of induction, ASCT, 2 cycles of consolidation and 12 cycles of continuous treatment with Iberdomide plus Isatuximab (Dexamethasone to be determined).In patients of Arm B included in ERI, due to the great variability of the possible moments of incorporation in this therapeutic program, only rules are established for the moment and the realization or not of the transplant. The evaluation of the results will be carried out separately in the patients included, butalso in conjunction with the rest of the patients in Arm B to know the effect of the global strategy.~After the evaluation of the primary endpoint, continuous/maintenance treatment continues in Arms A, B and C, including patients in ARM B assigned to the ERI program. Obtaining conventional CR in either arm will require a BM analysis for MRD. In the case of stable response or improvement without RC, MRD controls have been pre-established. Due to the lack of data on tolerance and adherence to long-term treatment with Isatuximab and Iberdomide, changes in the therapeutic programs, for this reason, a complete revision of the therapeutic program has been predetermined at the moment in which the last patient included in the clinical trial reaches 36 months of treatment. At this point, taking into account the updated knowledge about continuous or maintenance treatments, the strategies for a second clinical trial or an extension of this clinical trial will be defined.
This is a Phase III open-label, 3-arm, parallel, randomized, controlled trial. The allocation ratio 1:1:1 and outcome assessment are blind to group allocation. Patients will be randomized from 3 arms. Patients will receive VRD extended + ASCT plus ERI or Isatuximab-VRD + ASCT or Isatuximab-VID + ASCT.