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Published in: Cancer and Metastasis Reviews 1/2017

Open Access 01-03-2017 | NON-THEMATIC REVIEW

HER2/HER3 pathway in biliary tract malignancies; systematic review and meta-analysis: a potential therapeutic target?

Authors: Salvatore Galdy, Angela Lamarca, Mairéad G. McNamara, Richard A. Hubner, Chiara A. Cella, Nicola Fazio, Juan W. Valle

Published in: Cancer and Metastasis Reviews | Issue 1/2017

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Abstract

Human epidermal growth factor receptor 2 (HER2) overexpression and amplification have been reported as predictive markers for HER2-targeted therapy in breast and gastric cancer, whereas human epidermal growth factor receptor 3 (HER3) is emerging as a potential resistance factor. The aim of this study was to perform a systematic review and meta-analysis of the HER2 and HER3 overexpression and amplification in biliary tract cancers (BTCs). An electronic search of MEDLINE, American Society of Clinical Oncology (ASCO), European Society of Medical Oncology Congress (ESMO), and American Association for Cancer Research (AACR) was performed to identify studies reporting HER2 and/or HER3 membrane protein expression by immunohistochemistry (IHC) and/or gene amplification by in situ hybridization (ISH) in BTCs. Studies were classified as “high quality” (HQ) if IHC overexpression was defined as presence of moderate/strong staining or “low quality” (LQ) where “any” expression was considered positive. Of 440 studies screened, 40 met the inclusion criteria. Globally, HER2 expression rate was 26.5 % (95 % CI 18.9–34.1 %). When HQ studies were analyzed (n = 27 studies), extrahepatic BTCs showed a higher HER2 overexpression rate compared to intrahepatic cholangiocarcinoma: 19.9 % (95 % CI 12.8–27.1 %) vs. 4.8 % (95 % CI 0–14.5 %), respectively, p value 0.0049. HER2 amplification rate was higher in patients selected by HER2 overexpression compared to “unselected” patients: 57.6 % (95 % CI 16.2–99 %) vs. 17.9 % (95 % CI 0.1–35.4 %), respectively, p value 0.0072. HER3 overexpression (4/4 HQ studies) and amplification rates were 27.9 % (95 % CI 9.7–46.1 %) and 26.5 % (one study), respectively. Up to 20 % of extrahepatic BTCs appear to be HER2 overexpressed; of these, close to 60 % appear to be HER2 amplified, while HER3 is overexpressed or amplified in about 25 % of patients. Clinical relevance for targeted therapy should be tested in prospective clinical trials.
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Metadata
Title
HER2/HER3 pathway in biliary tract malignancies; systematic review and meta-analysis: a potential therapeutic target?
Authors
Salvatore Galdy
Angela Lamarca
Mairéad G. McNamara
Richard A. Hubner
Chiara A. Cella
Nicola Fazio
Juan W. Valle
Publication date
01-03-2017
Publisher
Springer US
Published in
Cancer and Metastasis Reviews / Issue 1/2017
Print ISSN: 0167-7659
Electronic ISSN: 1573-7233
DOI
https://doi.org/10.1007/s10555-016-9645-x

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