title: Automated fluorescent in situ hybridization (FISH) analysis of t(9;22)(q34;q11) in interphase nuclei.
abstract: BACKGROUND
  For chronic myeloid leukemia, the FISH detection of t(9;22)(q34;q11) in interphase nuclei of peripheral leukocytes is an alternative method to bone marrow karyotyping for monitoring treatment. With automation, several drawbacks of manual analysis may be circumvented. In this article, the capabilities of a commercially available automated image acquisition and analysis system were determined by detecting t(9;22)(q34;q11) in interphase nuclei of peripheral leukocytes.
  
  
  METHODS
  Three peripheral blood samples of normal adults, 21 samples of CML patients, and one sample of a t(9;22)(q34;q11) positive cell-line were used.
  
  
  RESULTS
  Single nuclei with correctly detected signals amounted to 99.6% of nuclei analyzed after exclusion of overlapping nuclei and nuclei with incorrect signal detection. A cut-off value of 0.84 mum was defined to discriminate between translocation positive and negative nuclei based on the shortest distance between signals. Using this value, the false positive rate of the automated analysis for negative samples was 7.0%, whereas that of the manual analysis was 5.8%. Automated and manual results showed strong correlation (R(2) = 0.985), the mean difference of results was only 3.7%.
  
  
  CONCLUSIONS
  A reliable and objective automated analysis of large numbers of cells is possible, avoiding interobserver variability and producing statistically more accurate results than manual evaluation.
authors.affiliation: Department of Pathology, Faculty of Medicine, University of Pécs, Hungary. bkajtar@pathology.pote.hu
authors.forename: Béla
authors.initials: B
authors.lastname: Kajtár
authors.forename: Gábor
authors.initials: G
authors.lastname: Méhes
authors.forename: Thomas
authors.initials: T
authors.lastname: Lörch
authors.forename: Linda
authors.initials: L
authors.lastname: Deák
authors.forename: Marika
authors.initials: M
authors.lastname: Kneifné
authors.forename: Donát
authors.initials: D
authors.lastname: Alpár
authors.forename: László
authors.initials: L
authors.lastname: Pajor
mesh_terms: D000328:Adult; D001773:Blood Cells / Q000737:chemistry; D002467:Cell Nucleus / Q000737:chemistry*; D002892:Chromosomes, Human, Pair 22; D002899:Chromosomes, Human, Pair 9; D005189:False Positive Reactions; D006801:Humans; D017404:In Situ Hybridization, Fluorescence / Q000379:methods*; D007399:Interphase / Q000235:genetics; D007621:Karyotyping; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000175:diagnosis* / Q000235:genetics; D010677:Philadelphia Chromosome; D012815:Signal Processing, Computer-Assisted; D014178:Translocation, Genetic