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Multiple myeloma is a cancer that harms plasma cells in the bone marrow. Plasma cells normally help fight infection, but in this case, they become cancerous. As the cancer grows and spreads, it may travel into and damage your bone tissue.
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Cancer that has developed in one place can spread and invade other parts of the body. This process of spreading is called metastasizing. If a tumor spreads to the bone, it is called bone metastasis.
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