Multiple myeloma is a cancer that commences in plasma cells which are a part of the white blood cells present in the blood circulation. These plasma cells play an important part in the immune system of the body by producing antibodies to help protect the body against infection and damage. In this disease, plasma cells become abnormal and are then termed as myeloma cells, which produce antibodies known as M proteins. These myeloma cells gradually crowd out the normal cells within the bones and produce symptoms in several bones at a time, because of which this condition is termed as multiple myeloma. When myeloma cells collect in one single bone, this mass is known as plasmacytoma.
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