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Types of Acute Lymphocytic Leukemia

Acute Lymphocytic Leukemia (ALL) is leukemia that affects lymphocytes, a type of white blood cell. It is not a single disease, but a group of related diseases. In the past, doctors divided ALL into the following three subtypes, based mainly on how the leukemia cells looked under the microscope:

  • L1. Most common in children

  • L2. Most common in adults

  • L3. Most aggressive type; also called Burkitt-type leukemia

Newer lab tests�now allow�doctors to divide ALL into more specific classifications, based on the type of lymphocyte the disease starts in and how mature the cells are.

  • Early Pre-B ALL

  • Common ALL

  • Pre-B ALL

  • Mature B-cell ALL (Burkitt-type leukemia)

  • Pre-T ALL

  • Mature T-cell ALL