Adverse events

Participants received Velcade (bortezomib) 1.3 milligrams per square meter (mg/m\^2) as subcutaneous (SC) injection, twice weekly at Weeks 1, 2, 4 and 5 in Cycle 1 followed by once weekly at Weeks 1, 2, 4 and 5 in Cycles 2 to 9, melphalan 9 mg/m\^2 orally once daily on Days 1 to 4 and prednisone 60 mg/m\^2 orally once daily on Days 1 to 4 of each cycle up to Cycle 9. Each treatment cycle was of 6 weeks. After completion of treatment, participants entered follow-up phase and were not started on subsequent anti-myeloma therapy without confirmed disease progression (assessed by the International Myeloma Working Group \[IMWG\] criteria). After implementation of Amendment 7, post interim overall survival (OS) analysis, sponsor confirmation of disease progression was no longer required prior to initiation of subsequent anti-myeloma therapy, except for participants who progressed on VMP arm and requested subsequent therapy with daratumumab.

Participants received Velcade 1.3 mg/m\^2 as SC injection, twice weekly at Weeks 1, 2, 4 and 5 in Cycle 1 followed by once weekly at weeks 1, 2, 4 and 5 in Cycles 2 to 9, melphalan 9 mg/m\^2, orally once daily on Days 1 to 4 and prednisone 60 mg/m\^2, orally once daily on Days 2 to 4 of each cycle up to Cycle 9. In addition, participants also received daratumumab 16 milligrams per kilogram (mg/kg) as intravenous (IV) infusion once weekly for 6 weeks in Cycle 1 and then once every 3 weeks in Cycle 2 to 9 and thereafter, once every 4 weeks (post-VMP treatment phase) until documented progression, unacceptable toxicity, or study end. On Day 1 of each cycle, dexamethasone 20 mg IV or per oral (PO) was given 1 hour or less prior to daratumumab infusion as pre-medication and prednisone substitute. Each treatment cycle was of 6 weeks. After implementation of Amendment 7, participants who were ongoing with daratumumab IV treatment were given an option to switch to daratumumab SC injection on Day 1 of any cycle, as per investigator's discretion. After completion of treatment, participants entered follow-up phase and were not started on subsequent anti-myeloma therapy without confirmed disease progression (assessed by IMWG criteria).