title: Cytogenetics and clinical features of pediatric myelodysplastic syndrome in Japan.
abstract: We analyzed the cytogenetics and clinical features of pediatric myelodysplastic syndrome (MDS) in Japan. Data on patients (<16 years) diagnosed with MDS from 1990 to 2000 were retrospectively collected from pediatric hematologists in 234 institutions. Chromosome analysis was successfully performed in 255 of 277 MDS patients. The numbers of patients with refractory anemia, refractory anemia with ringed sideroblasts, refractory anemia with excess of blasts (RAEB), refractory anemia with excess of blasts in transformation (RAEBt), chronic myelomonocytic leukemia, and juvenile myelomonocytic leukemia were 67 (24%), 51 (18%), 51 (18%), 20 (7%), and 65 (23%), respectively. The other 23 patients (8%) could not be classified specifically. The distribution of childhood MDS in Japan according to the French-American-British subclassification was similar to that in other countries. However, we identified a higher incidence of therapy-related cases. As for relationship between cytogenetics and prognoses, abnormal karyotypes were related to poorer prognoses than normal karyotype (P < 0.01). However, patients with trisomy 8 had prognoses comparable to those with normal karyotypes. Complex karyotypes were associated with poorer prognoses among RAEB and RAEBt patients. In conclusion, prognosis of pediatric MDS is related to cytogenetics. A more precise diagnosis and classification system is needed for childhood MDS.
authors.affiliation: Department of Pediatrics, Saitama Medical Center, Saitama Medical University, Saitama, Japan.
authors.forename: Koichi
authors.initials: K
authors.lastname: Moriwaki
authors.forename: Atsushi
authors.initials: A
authors.lastname: Manabe
authors.forename: Takeshi
authors.initials: T
authors.lastname: Taketani
authors.forename: Akira
authors.initials: A
authors.lastname: Kikuchi
authors.forename: Tatsutoshi
authors.initials: T
authors.lastname: Nakahata
authors.forename: Yasuhide
authors.initials: Y
authors.lastname: Hayashi
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D002869:Chromosome Aberrations; D020732:Cytogenetic Analysis; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007564:Japan / Q000453:epidemiology; D059785:Karyotype; D008297:Male; D009190:Myelodysplastic Syndromes / Q000175:diagnosis* / Q000453:epidemiology / Q000235:genetics* / Q000401:mortality; D011379:Prognosis; D012189:Retrospective Studies