title: [Clinical and experimental study of 7 cases of acute lymphoblastic leukemia with dic(7;9) (pll;pll)].
abstract: OBJECTIVE
  To investigate the laboratory and clinical features of 7 cases of acute lymphoblastic leukemia (ALL) with dic(7;9) (pll;pll).
  
  
  METHODS
  Cytogenetic examination of bone marrow cells was performed by direct method or short-term culture method. R banding technique was used for karyotype analysis. bcr/abl fusion gene was detected by interphase FISH using dual-color bcr/abl probe in 6 cases. FISH using chromosome 7-specific alpha-satellite DNA probe and chromosome 9-specific alpha-satellite DNA probe and chromosome painting using whole chromosome 7 and 9 paints probes were performed respectively.
  
  
  RESULTS
  Seven (0.88%) of 800 ALL patients were found to have dic(7;9) abnormality. Among them, dic(7;9) was the sole abnormality in 2 cases, t(9;22), other additional aberrations besides dic(7;9) in 4 cases and dic (7;9) with other abnormalities but no t(9;22) in one case. Hyperleukocytosis (> 100 x 10(9)/L) was found in 4 cases with dic(7;9) and t(9;22), and patients without t(9;22) had WBC < 100 x 10(9)/L. Enlargement of liver, spleen and/or lymph nodes were found in 6 cases. Immunophenotyping showed that 5/6 cases of dic (7;9) ALL were of B lineage. Dual-color FISH detected bcr/abl rearrangement in 3/6 cases and confirmed that the centromere of the derivative chromosome was originated from both chromosomes 7 and 9. A reciprocal translocation between chromosomes 7 and 9 was proved by chromosome painting.
  
  
  CONCLUSIONS
  dic(7;9) was a rare, but recurrent chromosome abnormality in ALL and had some clinical and laboratory features.
authors.affiliation: First Affiliated Hospital of Soochouw University, Jiangsu Institute of Hematology, Suzhou, China.
authors.forename: Jin-Lan
authors.initials: JL
authors.lastname: Pan
authors.forename: Yong-Quan
authors.initials: YQ
authors.lastname: Xue
authors.forename: Hai-Yan
authors.initials: HY
authors.lastname: Jiang
authors.forename: Yong-Jin
authors.initials: YJ
authors.lastname: Zhu
authors.forename: Li
authors.initials: L
authors.lastname: Ma
authors.forename: Tian-Yu
authors.initials: TY
authors.lastname: Li
authors.forename: Yong
authors.initials: Y
authors.lastname: Wang
authors.forename: Ya-Fang
authors.initials: YF
authors.lastname: Wu
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002897:Chromosomes, Human, Pair 7 / 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; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000235:genetics*; D014178:Translocation, Genetic