title: Mixed myeloproliferative and myelodysplastic disorders.
abstract: When the French-American-British (FAB) classification system was first devised in the 1970s for the myelodysplastic syndromes (MDS), chronic myelomonocytic leukemia (CMML) was included in the FAB MDS classification schema. It always appeared out of place, however, at least when compared with the other FAB MDS categories, as CMML clearly has some features of a myeloproliferative disorder. Yet CMML also did not fit well with the traditional four myeloproliferative disorders. In the 1990s there was ongoing discussion about distinguishing a proliferative type of CMML versus a dysplastic type of CMML, based primarily on the total white blood cell count. In 2001 the World Health Organization reclassified most of the hematologic malignancies, creating a new category of mixed myelodysplastic/myeloproliferative diseases. Finally, CMML has an appropriate home, along with other disorders that seem to fit quite well in this "mixed" category.
authors.affiliation: University of Alabama at Birmingham Comprehensive Cancer Center, 1824 Sixth Avenue South-WTI 520, Birmingham, AL 35294-3300, USA. peter.emanuel@ccc.uab.edu
authors.forename: Peter D
authors.initials: PD
authors.lastname: Emanuel
mesh_terms: D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D002869:Chromosome Aberrations; D016503:Drug Delivery Systems; D005260:Female; D006801:Humans; D007223:Infant; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000145:classification / Q000188:drug therapy / Q000453:epidemiology; D015477:Leukemia, Myelomonocytic, Chronic / Q000145:classification / Q000453:epidemiology / Q000628:therapy; D054429:Leukemia, Myelomonocytic, Juvenile / Q000453:epidemiology / Q000235:genetics / Q000628:therapy; D008297:Male; D008875:Middle Aged; D009154:Mutation; D054437:Myelodysplastic-Myeloproliferative Diseases / Q000145:classification / Q000175:diagnosis / Q000453:epidemiology / Q000235:genetics / Q000473:pathology; D011379:Prognosis; D017678:Sex Distribution; D014178:Translocation, Genetic