Time frame: After 4 Cycles of Induction (4 months), at End of Induction (4 to 8 months) and at the End of Maintenance (12 months)
ORR: percentage of participants achieved PR or better (PR,VGPR,CR,sCR) per IMWG. CR:negative immunofixation on serum, urine, disappearance of soft tissue plasmacytomas,<5% PCs in bone marrow(BM). sCR:CR plus normal FLC ratio,absence of clonal cells in BM by immunohistochemistry, immunofluorescence. VGPR:Serum, urine M-protein detectable by immunofixation but not on electrophoresis or >=90% reduction in serum M-protein plus urine M-protein level <100 mg/24hours. PR:>=50% reduction of serum M-protein and reduction in 24hours urinary M-protein by >=90% or to <200mg/24hours. If serum, urine M-protein unmeasurable, a>=50% decrease in difference involved and uninvolved FLC levels required in place of M-protein criteria. If serum, urine M-protein not measurable, serum free light assay is not measurable,>=50% reduction in PCs required in place of M-protein,provided baseline bone marrow PCs% >=30%, if present at baseline, a >=50% reduction in size of soft tissue plasmacytomas is also required.