Evaluation of reliability of FISH versus brightfield dual-probe in situ hybridization (BDISH) for frontline assessment of HER2 status in breast cancer samples in a community setting: Influence of poor tissue preservation

Beatriz N. Schiavon, Bharat Jasani, Louise De Brot, José Vassallo, Aline Damascena, Julio Cirullo-Neto, José Ivanildo Neves, Fernando Augusto Soares, Helenice Gobbi, Rafael Malagoli Rocha

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Abstract

AIMS: To evaluate the reliability of novel brightfield microscopy-based dual in situ hybridization (BDISH) methods for frontline HER2 status analysis in selected suboptimally preserved breast cancer tissue samples reflecting of the worst scenario in a community. METHODS AND RESULTS: A total of 320 morphologically poorly preserved breast invasive ductal carcinomas from the archives of 2 tertiary institutions in Brazil were selected for a tissue microarray-based analysis. 4B5 antibody was used for immunohistochemistry. Fluorescence in situ hybridization (FISH), DuoCISH, ZytoDot CISH, and silver in situ hybridization (SISH) were performed and compared. The highest agreement was observed between SISH and FISH. In addition, SISH was easier to assess in both amplified and nonamplified cases when compared with the other chromogenic methods, due to the sharpness of its dots. DuoCISH produced false-positive results, associated with thicker ill-defined dots, causing poor distinction between nonamplification and low amplification. ZytoDot CISH showed lower sensitivity, with increased frequency of false-positive results. CONCLUSIONS: SISH is the most reliable of the BDISH methods, with sensitivity and specificity highly comparable with FISH. It is also less deleterious than other BDISH methods, producing signals that were more distinct and therefore more readily analyzable even in poorly preserved tissue.

Original languageEnglish
Pages (from-to)1489-1496
Number of pages8
JournalAmerican Journal of Surgical Pathology
Volume36
Issue number10
DOIs
Publication statusPublished - Oct 1 2012

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Keywords

  • HER2
  • SISH
  • breast cancer
  • in situ hybridization

ASJC Scopus subject areas

  • Anatomy
  • Surgery
  • Pathology and Forensic Medicine

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