- Protein criteria must be present (quantifiable serum M-component of IgG, IgA, IgD, or IgE; urinary kappa or lambda light chain; or serum free light chain (SFLC) levels in order to evaluate response. Non-secretory patients are eligible provided the patient has > 20% plasmacytosis OR multiple (>3) focal plasmacytomas or focal lesions on MRI OR diffuse hyperintense signal on STIR images in the absence of hematopoietic growth factors.