A Phase 1/2, Multi-center, Open-label, Dose-escalation Study of Elotuzumab(Humanized Anti-CS1 Monoclonal IgG1 Antibody) and Bortezomib in Subjects With Multiple Myeloma Following One to Three Prior Therapies.

Cohort 1 - 2.5 mg/kg elotuzumab IV with bortezomib on Days 1 \& 11, with only Bortezomib IV on Days 4 \& 8; Cohort 2 - 5.0 mg/kg elotuzumab IV with bortezomib on Days 1 \& 11, with only Bortezomib IV on Days 4 \& 8; Cohort 3 - 10.0 mg/kg elotuzumab IV withbortezomib on Days 1 \& 11, with only Bortezomib IV on Days 4 \& 8; and Cohort 4 - 20.0 mg/kg elotuzumab IV with bortezomib on Days 1 \& 11, with only Bortezomib IV on Days 4 \& 8.