Blood cancer is a cancer that affects white blood cells found in the blood as well as the bone marrow where blood cells are made. In general, it can involve leukocytes, lymphocytes, plasma cells, and bone marrow cells that are the precursors of the cancerous cells. The main categories of blood cancers are leukemias, lymphomas, and multiple myeloma.
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References
Jameson, J. Larry, et al. Harrison's Principles of Internal Medicine, 20th Ed. New York: McGraw-Hill Education, 2018.