- Subjects with multiple myeloma (MM) must have detectable disease as measured by presence of monoclonal immunoglobulin protein in a serum electrophoresis: IgG, IgA, IgM, (M-protein ≥ 0.5 g/dl or serum IgD M-protein ≥ 0.05 g/dl) or serum free-light chain or 24 hour urine with free light chain. Excluded are subjects with only plasmacytomas, plasma cell leukemia, or non-secretory myeloma