title: Isodicentric chromosome 21: a novel aberration in acute myeloid leukemia.
abstract: We present here a 78-year-old female patient with acute myeloid leukemia (AML), French-American-British classification M2, exhibiting isodicentric chromosome 21, idic(21)(q22), at the time of diagnosis. The patient had three idic(21)(q22), besides the del(5)(q13q32), add(21)(q22), dic(21;22) (q22;q13), and +22. Fluorescence in situ hybridization studies with whole-chromosome painting and centromere-specific probes for chromosome 21 verified the diagnosis of idic(21)(q22). There were no distinct clinicohematological characteristics of AML with isodicentric 21. The patient was treated with remission-induction therapy followed by consolidation therapy. Two years later, the patient showed the disappearance of isodicentric 21 but retained del(5)(q13q32) and gained other chromosomal abnormalities, +add(17)(p11) and -16. To our knowledge, this is the first report of AML with acquired idic(21)(q22).
authors.affiliation: Department of Cancer Cytogenetics, Hiroshima University, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Sankar
authors.forename: K
authors.initials: K
authors.lastname: Tanaka
authors.forename: M
authors.initials: M
authors.lastname: Arif
authors.forename: T
authors.initials: T
authors.lastname: Shintani
authors.forename: T S
authors.initials: TS
authors.lastname: Kumaravel
authors.forename: T
authors.initials: T
authors.lastname: Kyo
authors.forename: H
authors.initials: H
authors.lastname: Dohy
authors.forename: N
authors.initials: N
authors.lastname: Kamada
mesh_terms: D000368:Aged; D002891:Chromosomes, Human, Pair 21 / Q000235:genetics*; D017809:Fatal Outcome; D005260:Female; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D018404:Isochromosomes / Q000235:genetics*; D007621:Karyotyping; D015470:Leukemia, Myeloid, Acute / Q000235:genetics*