NCIt definition : A clonal proliferation of immunoglobulin-secreting plasma cells. This category includes
multiple myeloma, plasma cell leukemia, plasmacytoma, and plasma cell post-transplant
lymphoproliferative disorder.;
Alternative definition : CDISC: A malignant neoplasm composed of plasma cells.; NCI-GLOSS: A tumor that begins in plasma cells (white blood cells that produce antibodies).
Multiple myeloma, monoclonal gammopathy of undetermined significance (MGUS), and plasmacytoma
are types of plasma cell tumors.;