Concomitant oncoprotein detection with fluorescence in situ hybridization (CODFISH): A fluorescence-based assay enabling simultaneous visualization of gene amplification and encoded protein expression

Raymond R. Tubbs, James Pettay, Pat Roche, Mark H. Stoler, Robert Jenkins, Jon Myles, Thomas Grogan

Research output: Contribution to journalArticle

22 Scopus citations


We sought the validation of a three-color fluorescence-based system that simultaneously profiles Her2/neu oncogene copy by fluorescence in situ hybridization (FISH) and Her-2/neu encoded protein by the use of a versatile alkaline phosphatase chromogen fast red K in either fluorescence or bright-field mode. Nuclei were counterstained with DAPI. Nineteen infiltrating ductal carcinomas of breast were comprehensively evaluated for Her-2/neu amplification/over-expression by direct and indirect FISH using digoxigenin (DigFISH) and direct fluorescently labeled probes, autoradiographic RNA:RNA in situ hybridization, and immunohistochemistry using monoclonal antibody CB11. CODFISH results correlated well with DigFISH, direct-label FISH, mRNA expression, and oncoprotein expression as assessed with CB11, and enabled simultaneous visualization of gene copy and protein. In addition, qualitative immunohistochemistry may be followed by CODFISH gene copy enumeration to clarify ambiguous cases.

Original languageEnglish (US)
Pages (from-to)78-83
Number of pages6
JournalJournal of Molecular Diagnostics
Issue number2
StatePublished - May 2000


ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Molecular Medicine

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