Leukemia is a type of disease.
Chronic myelogenous ( or myeloid or myelocytic ) leukemia ( CML ) , also known as chronic granulocytic leukemia ( CGL ) , is a cancer of the white blood cells . Leukemia , also spelled leukaemia , is a group of cancers that usually begin in the bone marrow and result in high numbers of abnormal white blood cells . It is the most common type of cancer in children , with three quarters of leukemia cases in children being the acute lymphoblastic type .