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Updated: Jan 28, 2026

Building Up a High-throughput Screening Platform to Assess the Heterogeneity of HER2 Gene Amplification in Breast Cancers
Published on: December 5, 2017
HER2 Directed Antibody-Drug-Conjugates beyond T-DM1 in Breast Cancer
Gabriel Rinnerthaler1,2, Simon Peter Gampenrieder3,4, Richard Greil5,6
1Department of Internal Medicine III with Haematology, Medical Oncology, Haemostaseology, Infectiology and Rheumatology, Oncologic Center, Salzburg Cancer Research Institute-Laboratory for Immunological and Molecular Cancer Research (SCRI-LIMCR), Paracelsus Medical University Salzburg, 5020 Salzburg, Austria. g.rinnerthaler@salk.at.
Abstract:
Since the discovery of the human epidermal growth factor receptor 2 (HER2) as an oncogenic driver in a subset of breast cancers and the development of HER2 directed therapies, the prognosis of HER2 amplified breast cancers has improved meaningfully. Next to monoclonal anti-HER2 antibodies and tyrosine kinase inhibitors, the antibody-drug conjugate T-DM1 is a pillar of targeted treatment of advanced HER2-positive breast cancers. Currently, several HER2 directed antibody-drug conjugates are under clinical investigation for HER2 amplified but also HER2 expressing but not amplified breast tumors. In this article, we review the current preclinical and clinical evidence of the investigational drugs A166, ALT-P7, ARX788, DHES0815A, DS-8201a, RC48, SYD985, MEDI4276 and XMT-1522.
Insights
HER2-targeted therapies have improved breast cancer outcomes. New antibody-drug conjugates show promise for HER2-amplified and HER2-expressing breast tumors, expanding treatment options.
Area of Science:
- Oncology
- Pharmacology
Background:
- Human epidermal growth factor receptor 2 (HER2) is an oncogenic driver in a subset of breast cancers.
- HER2-directed therapies have significantly improved the prognosis of HER2-amplified breast cancers.
- Trastuzumab emtansine (T-DM1) is a key antibody-drug conjugate for advanced HER2-positive breast cancer.
Purpose of the Study:
- To review preclinical and clinical evidence of investigational HER2-directed antibody-drug conjugates.
- To explore new therapeutic options for HER2-amplified and HER2-expressing breast tumors.
Main Methods:
- Review of current preclinical data.
- Analysis of ongoing clinical investigations.
Main Results:
- Several novel HER2-directed antibody-drug conjugates are under clinical investigation.
- These agents target both HER2-amplified and HER2-expressing, but not amplified, breast tumors.
Conclusions:
- Investigational antibody-drug conjugates represent a promising frontier in HER2-targeted breast cancer therapy.
- These new agents may offer expanded treatment avenues for a broader range of HER2-positive breast cancer patients.
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