Dual HER2 inhibition: mechanisms of synergy, patient selection, and resistance
Adrienne G Waks1,2,3, Olga Martínez-Sáez4,5,6, Paolo Tarantino1,2,7
1Medical Oncology, Dana-Farber Cancer Institute, Boston, MA, USA.
Abstract:
HER2-targeted therapies for patients with HER2+ breast cancer are rapidly evolving, offering a range of more complex and personalized treatment options. Currently, an array of anti-HER2 monoclonal antibodies, tyrosine kinase inhibitors and antibody-drug conjugates are administered, sometimes alongside chemotherapy or endocrine therapy, both in curative and palliative contexts. However, the heterogeneous nature of HER2+ breast cancer demands a deeper understanding of disease biology and its role in responsiveness to novel HER2-targeted agents, as well as non-HER2-targeted therapies, in order to optimize patient outcomes. In this Review, we revisit the mechanisms of action of HER2-targeted agents, examine the evidence supporting the use of dual HER2 blockade in patients with HER2-amplified tumours, and explore the role of biomarkers in guiding future treatment strategies. We also discuss potential implications for the future treatment of patients with HER2+ breast cancer.
Insights
Novel HER2-targeted therapies are advancing for HER2-positive breast cancer. Understanding tumor biology and biomarkers is crucial for optimizing personalized treatment strategies and improving patient outcomes.
Area of Science:
- Oncology
- Pharmacology
Background:
- HER2-positive breast cancer treatments are evolving with targeted therapies.
- Current options include monoclonal antibodies, tyrosine kinase inhibitors, and antibody-drug conjugates, often combined with chemotherapy or endocrine therapy.
Purpose of the Study:
- To review mechanisms of action for HER2-targeted agents.
- To examine evidence for dual HER2 blockade in HER2-amplified tumors.
- To explore biomarker roles in guiding future HER2+ breast cancer treatment strategies.
Main Methods:
- Literature review of HER2-targeted therapies.
- Analysis of clinical evidence for dual HER2 blockade.
- Discussion of biomarker utility in personalized medicine.
Main Results:
- HER2-targeted therapies offer personalized treatment options for HER2+ breast cancer.
- Dual HER2 blockade shows promise in HER2-amplified tumors.
- Biomarkers are key to optimizing treatment selection and patient outcomes.
Conclusions:
- Deeper understanding of HER2+ breast cancer biology is needed to optimize novel agent responsiveness.
- Biomarker-guided strategies are essential for future personalized treatment of HER2+ breast cancer.
- The review discusses implications for future therapeutic approaches.
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