A Case of Non Secretory Type Multiple Myeloma Associated with Systemic Lupus Erythematosus

The development of malignant tumors is a more frequent finding in lupus patients than the general population. However, the incidence of multiple myeloma associated with systemic lupus erythematosus (SLE) is a rare manifestation. SLE is an autoimmune disease characterized by B cell hyperactivity, formation of autoantibodies, and multi-clonal hypergammaglobulinemia. Serum immunoglobulin increases, with a specific increase in IgG, which is due to an increase in autoantibody formation related to extrinsic and intrinsic antigens. We report on a patient with SLE combined with IgG, lambda type nonsecretory multiple myeloma, which was diagnosed with refractory anemia and hypergammaglobulinemia.