Types of Leukemia The four most common types of leukemia are listed here: Acute Myelogenous Leukemia (AML) – The cancer begins in immature granulocytic blood cells and progressesvery quickly. This type occurs in both adults and children. It is sometimes called acute myelocytic leukemia, acutemyeloid leukemia, acute granulocytic leukemia, or acute nonlymphocytic leukemia. Acute Lymphocytic Leukemia (ALL) – The cancer begins in immature lymphocytic blood cells and progresses very quickly. This is the most common form of childhood leukemia and is highly curable in children. When itaffects adults, it is an aggressive disease. It is sometimes called acute lymphocytic anemia or acute lymphoidanemia. Chronic Myelogenous Leukemia (CML) – The cancer begins in more mature granulocytic blood cells andprogresses gradually. This occurs mainly in adults, but may occur in a very small number of children. It issometimes called chronic myeloid leukemia or chronic granulocytic leukemia. It is associated with a specificmolecular event, the formation of the Philadelphia Chromosome and the activation of an enzyme that is now thetarget of a new drug called STI-571 (Gleevec). Chronic Lymphocytic Leukemia (CLL) – The cancer begins in more mature lymphocytic blood cells andprogresses gradually. This type most often occurs in adults over age 55. It sometimes occurs in younger adults, butrarely occurs in children. It is sometime called chronic lymphoid leukemia.

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