- Participant has documented relapsed or progressive multiple myeloma on or after any regimen or who are refractory to the most recent line of therapy. Relapsed myeloma is defined as previously treated myeloma that progresses and requires initiation of salvage therapy, but does not meet the criteria for refractory myeloma. Refractory myeloma is defined as disease that is non responsive (failure to achieve minimal response or development of progressive disease [PD]) while on primary or salvage therapy, or progresses within 60 days of last therapy.