PMID- 19762531 OWN - NLM STAT- MEDLINE DCOM- 20091001 LR - 20220317 IS - 1943-7722 (Electronic) IS - 0002-9173 (Linking) VI - 132 IP - 4 DP - 2009 Oct TI - Emerging technologies for assessing HER2 amplification. PG - 539-48 LID - 10.1309/AJCPV2I0HGPMGBSQ [doi] AB - Patients with human epidermal growth factor receptor-2 (HER2)+ breast cancer are eligible for trastuzumab treatment; therefore, accurate assessment of HER2 status is essential. Until recently, only 2 methods were validated for determining the HER2 status of breast tumors in the routine diagnostic setting: immunohistochemical analysis and fluorescence in situ hybridization (FISH). Recently, bright-field in situ hybridization techniques such as chromogenic in situ hybridization (CISH) and silver-enhanced in situ hybridization (SISH), which combine features of immunohistochemical analysis and FISH, have been introduced for the determination of HER2 status. These new techniques use a peroxidase enzyme-labeled probe with chromogenic detection, instead of a fluorescent-labeled probe, allowing results to be visualized by standard bright-field microscopy. Thus, the histologic features and HER2 status of a specimen can be evaluated in parallel. Moreover, signals do not decay over time. This review discusses recent publications regarding CISH and SISH testing, including results scoring and concordance between FISH and immunohistochemical analysis. FAU - Penault-Llorca, Frederique AU - Penault-Llorca F AD - Department de Pathologie, Centre Jean Perrin, 63011 Clermont-Ferrand Cedex, France. FAU - Bilous, Michael AU - Bilous M FAU - Dowsett, Mitch AU - Dowsett M FAU - Hanna, Wedad AU - Hanna W FAU - Osamura, Robert Yoshiyuki AU - Osamura RY FAU - Ruschoff, Josef AU - Ruschoff J FAU - van de Vijver, Marc AU - van de Vijver M LA - eng GR - BREAST CANCER NOW RESEARCH CENTRE/BCN_/Breast Cancer Now/United Kingdom PT - Comparative Study PT - Journal Article PT - Review PL - England TA - Am J Clin Pathol JT - American journal of clinical pathology JID - 0370470 RN - 0 (Antibodies, Monoclonal) RN - 0 (Antibodies, Monoclonal, Humanized) RN - 0 (Chromogenic Compounds) RN - 3M4G523W1G (Silver) RN - EC 2.7.10.1 (ERBB2 protein, human) RN - EC 2.7.10.1 (Receptor, ErbB-2) RN - P188ANX8CK (Trastuzumab) SB - IM MH - Algorithms MH - Antibodies, Monoclonal MH - Antibodies, Monoclonal, Humanized MH - Breast Neoplasms/genetics MH - Chromogenic Compounds MH - *Gene Amplification MH - Genes, erbB-2/*genetics MH - Humans MH - Immunohistochemistry/methods MH - In Situ Hybridization/methods MH - In Situ Hybridization, Fluorescence/methods MH - Observer Variation MH - Receptor, ErbB-2/biosynthesis/genetics MH - Silver MH - Trastuzumab RF - 72 EDAT- 2009/09/19 06:00 MHDA- 2009/10/02 06:00 CRDT- 2009/09/19 06:00 PHST- 2009/09/19 06:00 [entrez] PHST- 2009/09/19 06:00 [pubmed] PHST- 2009/10/02 06:00 [medline] AID - 132/4/539 [pii] AID - 10.1309/AJCPV2I0HGPMGBSQ [doi] PST - ppublish SO - Am J Clin Pathol. 2009 Oct;132(4):539-48. doi: 10.1309/AJCPV2I0HGPMGBSQ.