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multiple myeloma
a malignant neoplasm of plasma cells in which the plasma cells proliferate and invade the bone marrow, causing destruction of the bone and resulting in pathologic fracture and bone pain.
It is the most common type of monoclonal gammopathy, characterized by presence of a monoclonal immunoglobulin (immunoglobulin recognized as a single protein), Bence Jones proteins in the urine, anemia, and lowered resistance to infection. Called also plasma cell myeloma.

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