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FAB classification

French-American-British classification of acute leukemia Hematology A schema that divides acute leukemias into lymphoid–ALL or myeloid–AML cell lines; of childhood ALL, 70% are predominantly L1, 27% are L2, and 3% or less are L3 or Burkitt cell type, in adults with ALL, 30% are L1, 65% are L2, and 5% are L3
FAB classification, acute leukemias
Acute lymphocytic leukemia (ALL)
L1  Small monotonous lymphocytes
L2  Mixed L1- and L3-type lymphocytes
L3  Large homogeneous blast cells
Acute myeloid leukemia (AML)
M1  Myeloblasts without maturation
M2  Myeloblasts with maturation (best AML prognosis)
M3  Hypergranular promyelocytic leukemia (faggot cells)
M3V  Variant, microgranular promyelocytic leukemia
M4  Myelomonocytic leukocytes
M5  Monocytic, subtype
  a. Poorly differentiated monocytic leukemia
  b. Well differentiated monocytic leukemia
M6  Erythroleukemia/DiGuglielmo syndrome
M7  Megakaryocytic leukemia Pleomorphic undifferentiated cells with cytoplasmic blebs; myelofibrosis or ↑ BM reticulin; positive for platelet peroxidase antifactor VIII
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.




acute megakaryoblastic leukemia.
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
This article describes a semi-empirical [12-13] study on the thermodynamics involved in the synthesis of o-6, m-7 and p-8.
Equilibrium constants and reaction yields follow the order o-6 greater than m-7 greater than p-8 which are given in Table 4.
Table 4: Equilibrium Constants and yield of o-6, m-7 and p-8
A new M-7 pedestal now allows Soldiers to mount machine guns and grenade launchers in the rear of their HMMWV's open cargo bed to improve convoy protection.
The Joint Manufacturing and Technology Center at Rock Island Arsenal has been contracted to produce 4,500 of the new M-7 pedestals.
The M-7 pedestal allows Soldier to mount the M-249, M-240B, and M2 machine guns and the MK-19 grenade launcher in the rear cargo bed of M998 HMMWV.