Cancers that begin in the blood-forming tissue of the bone marrow are
called leukemias. These cancers do not form solid tumors. Instead, large
numbers of abnormal white blood cells (leukemia cells and leukemic
blast cells) build up in the blood and bone marrow, crowding out normal
blood cells. The low level of normal blood cells can make it harder for
the body to get oxygen to its tissues, control bleeding, or fight
infections.
There are four common types of leukemia, which are grouped based on how
quickly the disease gets worse (acute or chronic) and on the type of
blood cell the cancer starts in (lymphoblastic or myeloid)
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