title: ImmunoFISH is a reliable technique for the assessment of 1p and 19q status in oligodendrogliomas.
abstract: OBJECTIVE
  To develop a new ImmunoFISH technique for the study of oligodendrogliomas by combining a standard immunohistochemical stain using MIB-1 antibody with a standard FISH technique using commercial 1p36 and 19q13 chromosomal probes.
  
  
  METHODS
  Validation was performed by two observers on a series of 36 pre-selected oligodendrogliomas and compared to the results previously determined by FISH alone.
  
  
  RESULTS
  The ImFISH technique is easy to perform and to analyze and is no more time-consuming than the usual FISH technique. Our results show that the inter-observer reliability of ImFISH is high (κ = 0.86 and 0.95 respectively for 1p and 19q). Compared to FISH, the ImFISH exhibits a very high sensitivity (∼100%) and specificity (∼90%) for 1p and/or 19q deleted cases. The sensitivity is high for normal cases (∼85%) and imbalanced cases (∼90%) with a specificity ranging between 50 and 85%. Finally, there were no significant differences between FISH and ImFISH results calculated on 60, 40 or 20 cells.
  
  
  CONCLUSIONS
  Our study demonstrates the reliability of the ImFISH technique in oligodendrogliomas and emphasizes its advantage in poorly cellular tumoral specimen.
authors.affiliation: Department of Pathology, Centre Hospitalier Universitaire de Québec, Québec, Canada.
authors.forename: Céline
authors.initials: C
authors.lastname: Duval
authors.affiliation: Department of genomic and molecular genetics, Centre Hospitalier Universitaire de Rennes, Rennes, France.
authors.forename: Marie
authors.initials: M
authors.lastname: de Tayrac
authors.affiliation: Department of Pathology, Centre Hospitalier Universitaire de Québec, Québec, Canada.
authors.forename: François
authors.initials: F
authors.lastname: Sanschagrin
authors.affiliation: Department of Neurosurgery, Centre Hospitalier Universitaire de Québec, Québec, Canada.
authors.forename: Karine
authors.initials: K
authors.lastname: Michaud
authors.affiliation: Department of Pathology, Centre Hospitalier Universitaire de Québec, Québec, Canada.
authors.forename: Peter Vincent
authors.initials: PV
authors.lastname: Gould
authors.affiliation: Department of Pathology, Centre Hospitalier Universitaire de Québec, Québec, Canada.
authors.forename: Stéphan
authors.initials: S
authors.lastname: Saikali
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000974:Antibodies, Antinuclear / Q000378:metabolism*; D000911:Antibodies, Monoclonal / Q000378:metabolism*; D001932:Brain Neoplasms / Q000235:genetics* / Q000378:metabolism; D002878:Chromosomes, Human, Pair 1 / Q000235:genetics* / Q000378:metabolism; D002888:Chromosomes, Human, Pair 19 / Q000235:genetics* / Q000378:metabolism; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D017404:In Situ Hybridization, Fluorescence / Q000379:methods*; D008297:Male; D008875:Middle Aged; D015588:Observer Variation; D009837:Oligodendroglioma / Q000235:genetics* / Q000378:metabolism; D015203:Reproducibility of Results
chemical_list: D000974:Antibodies, Antinuclear; D000911:Antibodies, Monoclonal; C440408:MIB-1 antibody