The uncontrolled growth of white bloods cells in bone marrow, often
overflowing to the circulating blood. As cancers of white blood cells, some
leukemias and lymphomas are related; some are distinguished from each other only
by their relative presence in marrow versus lymph nodes It is the most common
type of blood cancer and affects 10 times as many adults as children. Most
people diagnosed with leukemia are over 50 years old.
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