title: [Clinical and laboratory characteristics of two acute lymphoblastic leukemia patients with dicentric (9; 20) (p11 - 13; q11)].
abstract: OBJECTIVE
  To explore the morphologic, immunophenotypic, cytogenetic and clinical features of acute lymphoblastic leukemia (ALL) patients with dicentric (9; 20) (p11 - 13; q11).
  
  
  METHODS
  Chromosome specimens of bone marrow cells were prepared by direct method and/or short-time culture. Karyo-typing was performed by R-banding technique. Dual-color fluorescence in situ hybridization (FISH) was performed using both chromosome 9 classical satellite probe and chromosome 20 alpha-satellite probe in one patient.
  
  
  RESULTS
  The two ALL patients were positive for CD10 and HLA-DR, showing of B cell origin. Both patients had dicentric (9; 20): case 1 was 45, XY, der (9) t (9; 20) (p11; q11), -20[20]; case 2 was 45, XX, der (9) t (9; 20) (p13; q11), t (9; 22) (q34; q11), -20[10]/46, idem, +8[16]/47, idem, +8, +21[14]. Mutual translocation between chromosomes 9 and 20 of the dicentric chromosome was confirmed by FISH in one patient.
  
  
  CONCLUSIONS
  Dicentric (9; 20) (p11 - 13; q11) is a rare recurring chromosome abnormality associated with ALL. Because of the subtle nature of the translocation, FISH is essential for the detection of this abnormality.
authors.affiliation: Department of Hematology, Changhai Hospital, Second Military Medical University, Shanghai 200433, China.
authors.forename: Sheng-lan
authors.initials: SL
authors.lastname: Gong
authors.forename: Hui-ying
authors.initials: HY
authors.lastname: Qiu
authors.forename: Jin-ying
authors.initials: JY
authors.lastname: Li
authors.forename: Feng-lai
authors.initials: FL
authors.lastname: Han
authors.forename: Xian-min
authors.initials: XM
authors.lastname: Song
authors.forename: Zheng-xia
authors.initials: ZX
authors.lastname: Huang
authors.forename: Jian-min
authors.initials: JM
authors.lastname: Wang
mesh_terms: D000328:Adult; D001483:Base Sequence; D002871:Chromosome Banding; D002890:Chromosomes, Human, Pair 20 / Q000235:genetics*; D002899:Chromosomes, Human, Pair 9 / Q000235:genetics*; D005260:Female; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007621:Karyotyping; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000235:genetics* / Q000473:pathology; D017422:Sequence Analysis, DNA; D014178:Translocation, Genetic