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Multiple myeloma is a type of blood cancer (a hematologic cancer) that affects the plasma cells, a type of white blood cell that is responsible for making the antibodies for the immune system that mark bacteria, viruses, or other cancer cells for destruction and removal from the body. For reference, the different types of leukemia are also hematologic cancers that affect the white blood cells of the immune system.
In multiple myeloma, the cancerous plasma cells grow out of control and collect in...