Participants received thalidomide in 28-day cycles: 50 mg, for the first 2 weeks, escalated to 100 mg for the next 2 weeks and beginning with Cycle 2, to 200 mg once daily. Elotuzumab, 10 mg/kg, was administered as an intravenous infusion weekly for the first 2 cycles and beginning with Cycle 3, every 2 weeks. Dexamethasone, 40 mg, was administered weekly on those weeks when elotuzumab was not administered. On weeks when elotuzumab was also given, participants received dexamethasone as a split dose of 28 mg, 3 to 24 hours before the elotuzumab infusion, and 8 mg intravenously at least 45 minutes before the infusion. Those patients with suboptimal response, defined as evidence of progressive disease between end of Cycle 2 and end of Cycle 4 or inability to achieve partial response or better by end of Cycle 4, also received cyclophosphamide, 50 mg. Cyclophosphamide could not be added beyond Cycle 5.

Participants received thalidomide in 28-day cycles: 50 mg, for the first 2 weeks, escalated to 100 mg for the next 2 weeks, then beginning with Cycle 2, to 200 mg once daily. Elotuzumab, 10 mg/kg, was administered as an intravenous infusion weekly for the first 2 cycles, then beginning with Cycle 3, every 2 weeks. Dexamethasone, 40 mg, was administered weekly on those weeks when elotuzumab was not administered. On weeks when elotuzumab was also given, participants received dexamethasone as a split dose of 28 mg, 3 to 24 hours before the elotuzumab infusion, and 8 mg intravenously at least 45 minutes before the infusion. Those patients with suboptimal response, defined as evidence of progressive disease between end of Cycle 2 and end of Cycle 4 or inability to achieve partial response or better by end of Cycle 4, also received cyclophosphamide, 50 mg. Cyclophosphamide could not be added beyond Cycle 5.

Participants received thalidomide in 28-day cycles: 50 mg, for the first 2 weeks, escalated to 100 mg for the next 2 weeks and beginning with Cycle 2, to 200 mg once daily. Elotuzumab, 10 mg/kg, was administered as an intravenous infusion weekly for the first 2 cycles, then beginning with Cycle 3, every 2 weeks. Dexamethasone, 40 mg, was administered weekly on those weeks when elotuzumab was not administered. On weeks when elotuzumab was also given, participants received dexamethasone as a split dose of 28 mg, 3 to 24 hours before the elotuzumab infusion, and 8 mg intravenously at least 45 minutes before the infusion.

Participants received thalidomide in 28-day cycles: 50 mg, for the first 2 weeks, escalated to 100 mg for the next 2 weeks, then beginning with Cycle 2, to 200 mg once daily. Elotuzumab, 10 mg/kg, was administered as an intravenous infusion weekly for the first 2 cycles, then beginning with Cycle 3, every 2 weeks. Dexamethasone, 40 mg, was administered weekly on those weeks when elotuzumab was not administered. On weeks when elotuzumab was also given, participants received dexamethasone as a split dose of 28 mg, 3 to 24 hours before the elotuzumab infusion, and 8 mg intravenously at least 45 minutes before the infusion.