Annals of Oncology 10:1419-1432, 1999
© 1999 European Society for Medical Oncology
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The World Health Organization Classification of Neoplastic Diseases of the Hematopoietic and Lymphoid Tissues
Report of the Clinical Advisory Committee Meeting, Airlie House, Virginia, November, 1997
1Departments of Pathology. Massachusetts General Hospital and Harvard Medical School Boston, MA, USA
2National Cancer Institute Bethesda, MD, USA
3Hotel Dieu, Paris, France
4Hopital Necker Paris, France
5University of Wurzburg Wurzburg, Germany
6Pritzker School of Medicine, University of Chicago Chicago, IL, USA
7Department of Medical Oncology, St. Bartholomew's Hospital London, UK
8Ohio State University Comprehensive Cancer Center Columbus, OH, USA
Correspondence to: N. L. Harris, MD, Pathology, Warren 2, Massachusetts General Hospital, Fruit Street, Boston, MA 02114, USA E-mail: nlharris{at}partners.org
Introduction: Since 1995, the European Association of Pathologists (EAHP) and the Society for Hematopathology (SH) have been developing a new World Health Organization (WHO) Classification of hematologic malignancies. The classification includes lymphoid, myeloid, histiocytic, and mast cell neoplasms.
Design. The WHO project involves 10 committees of pathologists, who have developed lists and definitions of disease entities. A Clinical Advisory Committee (CAC) ) of international hematologists and oncologists was formed to ensure that the classification will be useful to clinicians. A meeting was held in November, 1997, to discuss clinical issues related to the classification.
Results: The WHO has adopted the Revised EuropeanAmerican Classification of Lymphoid Neoplasms (R.E.A.L.), published in 1994 by the International Lymphoma Study Group (ILSG), as the classification of lymphoid neoplasms. This approach to classification is based on the principle that a classification is a list of real disease entities, which are defined by a combination of morphology, immunophenotype, genetic features, and clinical features. The relative importance of each of these features varies among diseases, and there is no one gold standard. The WHO Classification has applied the principles of the R.E.A.L. Classification to myeloid and histiocytic neoplasms. The classification of myeloid neoplasms recognizes distinct entities defined by a combination of morphology and cytogenetic abnormalities.
The CAC meeting, which was organized around a series of clinical questions, was able to reach a consensus on most of the questions posed. The questions and the consensus are discussed in detail below. Among other things, the CAC concluded that clinical groupings of lymphoid neoplasms were neither necessary nor desirable. Patient treatment is determined by the specific type of lymphoma, with the addition of grade within the tumor type, if applicable, and clinical prognostic factors such as the international prognostic index (IPI).
Conclusion: The experience of developing the WHO Classification has produced a new and exciting degree of cooperation and communication between oncologists and pathologists from around the world, which should facilitate progress in the understanding and treatment of hematologic malignancies.
classification, histiocytic, lymphoma, leukemia, myeloid, mast cell
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