Acute myeloid leukemia classification: Difference between revisions
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===French-American-British classification=== | ===French-American-British classification=== | ||
The [[French-American-British classification | French-American-British (FAB) classification]] system divided AML into 8 subtypes, M0 through to M7, based on the type of cell from which the leukemia developed and its degree of maturity. This is done by examining the appearance of the malignant cells under [[light microscopy]] and/or by using [[cytogenetics]] to characterize any underlying chromosomal abnormalities. The subtypes have varying prognoses and responses to therapy. Although the WHO classification (see below) may be more useful, the FAB system is still widely used as of mid-2006. | The [[French-American-British classification | French-American-British (FAB) classification]] system divided AML into 8 subtypes, M0 through to M7, based on the type of cell from which the leukemia developed and its degree of maturity. This is done by examining the appearance of the malignant cells under [[light microscopy]] and/or by using [[cytogenetics]] to characterize any underlying chromosomal abnormalities. The subtypes have varying prognoses and responses to therapy. Although the WHO classification (see below) may be more useful, the FAB system is still widely used as of mid-2006. | ||
The eight FAB subtypes are:<ref>{{cite journal | author = Bennett J, Catovsky D, Daniel M, Flandrin G, Galton D, Gralnick H, Sultan C | title = Proposals for the classification of the acute leukaemias. French-American-British (FAB) co-operative group | journal = Br J Haematol | volume = 33 | issue = 4 | pages = 451-8 | year = 1976 | pmid = 188440}}</ref> | The eight FAB subtypes are:<ref>{{cite journal | author = Bennett J, Catovsky D, Daniel M, Flandrin G, Galton D, Gralnick H, Sultan C | title = Proposals for the classification of the acute leukaemias. French-American-British (FAB) co-operative group | journal = Br J Haematol | volume = 33 | issue = 4 | pages = 451-8 | year = 1976 | pmid = 188440}}</ref> | ||
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===World Health Organization classification === | ===World Health Organization classification === | ||
The [[World Health Organization]] (WHO) classification of acute myeloid leukemia attempts to be more clinically useful and to produce more meaningful prognostic information than the FAB criteria. Each of the WHO categories contains numerous descriptive sub-categories of interest to the [[hematopathologist]] and [[oncologist]]; however, most of the clinically significant information in the WHO schema is communicated via categorization into one of the five subtypes listed below. | The [[World Health Organization]] (WHO) classification of acute myeloid leukemia attempts to be more clinically useful and to produce more meaningful prognostic information than the FAB criteria. Each of the WHO categories contains numerous descriptive sub-categories of interest to the [[hematopathologist]] and [[oncologist]]; however, most of the clinically significant information in the WHO schema is communicated via categorization into one of the five subtypes listed below. | ||
The WHO subtypes of AML are:<ref>{{cite journal | author = Vardiman J, Harris N, Brunning R | title = The World Health Organization (WHO) classification of the myeloid neoplasms | journal = Blood | volume = 100 | issue = 7 | pages = 2292-302 | year = 2002 | pmid = 12239137}}'' [http://www.bloodjournal.org/cgi/content/full/100/7/2292 Full text]''.</ref> | The WHO subtypes of AML are:<ref>{{cite journal | author = Vardiman J, Harris N, Brunning R | title = The World Health Organization (WHO) classification of the myeloid neoplasms | journal = Blood | volume = 100 | issue = 7 | pages = 2292-302 | year = 2002 | pmid = 12239137}}'' [http://www.bloodjournal.org/cgi/content/full/100/7/2292 Full text]''.</ref> | ||
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| '''AML with multilineage dysplasia''' | | '''AML with multilineage dysplasia''' | ||
| This category includes patients who have had a prior [[myelodysplastic syndrome]] (MDS) or [[myeloproliferative disease]] (MPD) that transforms into AML. This category of AML occurs most often in elderly patients and often has a worse prognosis. | | This category includes patients who have had a prior [[myelodysplastic syndrome]] (MDS) or [[myeloproliferative disease]] (MPD) that transforms into AML. This category of AML occurs most often in elderly patients and often has a worse prognosis. | ||
| {{ICDO|9895|3}} | | {{ICDO|9895|3}} | ||
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| '''AML and MDS, therapy-related''' | | '''AML and MDS, therapy-related''' | ||
| This category includes patients who have had prior chemotherapy and/or radiation and subsequently develop AML or MDS. These leukemias may be characterized by specific chromosomal abnormalities, and often carry a worse prognosis. | | This category includes patients who have had prior chemotherapy and/or radiation and subsequently develop AML or MDS. These leukemias may be characterized by specific chromosomal abnormalities, and often carry a worse prognosis. | ||
| {{ICDO|9920|3}} | | {{ICDO|9920|3}} | ||
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Revision as of 14:17, 8 August 2012
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Acute myeloid leukemia Microchapters |
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Acute myeloid leukemia classification On the Web |
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American Roentgen Ray Society Images of Acute myeloid leukemia classification |
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Risk calculators and risk factors for Acute myeloid leukemia classification |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Raviteja Guddeti, M.B.B.S. [2]
Overview
Classification
The two most commonly used classification schemata for AML, as of 2006, are the older French-American-British (FAB) system and the newer World Health Organization (WHO) system.
French-American-British classification
The French-American-British (FAB) classification system divided AML into 8 subtypes, M0 through to M7, based on the type of cell from which the leukemia developed and its degree of maturity. This is done by examining the appearance of the malignant cells under light microscopy and/or by using cytogenetics to characterize any underlying chromosomal abnormalities. The subtypes have varying prognoses and responses to therapy. Although the WHO classification (see below) may be more useful, the FAB system is still widely used as of mid-2006.
The eight FAB subtypes are:[1]
| Type | Name | Cytogenetics |
|---|---|---|
| M0 | Minimally differentiated AML | |
| M1 | Acute myeloblastic leukemia, without maturation | |
| M2 | Acute myeloblastic leukemia, with granulocytic maturation | t(8;21)(q22;q22), t(6;9) |
| M3 | Promyelocytic, or Acute promyelocytic leukemia (APL) | t(15;17) |
| M4 | Acute myelomonocytic leukemia | inv(16)(p13q22), del(16q) |
| M4eo | Myelomonocytic together with bone marrow eosinophilia | inv(16), t(16;16) |
| M5 | Acute monoblastic leukemia (M5a) or Acute monocytic leukemia (M5b) | del (11q), t(9;11), t(11;19) |
| M6 | Acute erythroid leukemias, including erythroleukemia (M6a) and very rare pure erythroid leukemia (M6b) | |
| M7 | Acute megakaryoblastic leukemia | t(1;22) |
World Health Organization classification
The World Health Organization (WHO) classification of acute myeloid leukemia attempts to be more clinically useful and to produce more meaningful prognostic information than the FAB criteria. Each of the WHO categories contains numerous descriptive sub-categories of interest to the hematopathologist and oncologist; however, most of the clinically significant information in the WHO schema is communicated via categorization into one of the five subtypes listed below.
The WHO subtypes of AML are:[2]
| Name | Description | ICD-O |
|---|---|---|
| AML with characteristic genetic abnormalities | Includes:
Patients with AML in this category generally have a high rate of remission and a better prognosis compared to other types of AML. |
Multiple |
| AML with multilineage dysplasia | This category includes patients who have had a prior myelodysplastic syndrome (MDS) or myeloproliferative disease (MPD) that transforms into AML. This category of AML occurs most often in elderly patients and often has a worse prognosis. | Template:ICDO |
| AML and MDS, therapy-related | This category includes patients who have had prior chemotherapy and/or radiation and subsequently develop AML or MDS. These leukemias may be characterized by specific chromosomal abnormalities, and often carry a worse prognosis. | Template:ICDO |
| AML not otherwise categorized | Includes subtypes of AML that do not fall into the above categories. | Template:ICDO |
Acute leukemias of ambiguous lineage (also known as mixed phenotype or biphenotypic acute leukemia) occur when the leukemic cells can not be classified as either myeloid or lymphoid cells, or where both types of cells are present.
References
- ↑ Bennett J, Catovsky D, Daniel M, Flandrin G, Galton D, Gralnick H, Sultan C (1976). "Proposals for the classification of the acute leukaemias. French-American-British (FAB) co-operative group". Br J Haematol. 33 (4): 451–8. PMID 188440.
- ↑ Vardiman J, Harris N, Brunning R (2002). "The World Health Organization (WHO) classification of the myeloid neoplasms". Blood. 100 (7): 2292–302. PMID 12239137. Full text.