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HER2-Positive Metastatic Breast Cancer: Available Treatments and Current Developments
Ismail Essadi1, Zineb Benbrahim2, Mohamed Kaakoua1
1Medical Oncology, Ibn Sina Military Hospital, Faculty of Medicine, Cadi Ayyad University, Marrakesh 40080, Morocco.
Abstract:
For several years, the overexpression of the HER2 receptor in breast cancer has been correlated with a poor prognosis and an increased risk of developing brain metastases. Currently, the combination of anti-HER2 double blockade and taxane and trastuzumab emtansine (T-DM1) are considered the standard treatments for metastatic breast cancer overexpressing these receptors in the first and second line. Very recently, the development of a new antidrug conjugate, trastuzumab-deruxtecan, has improved the overall survival of patients, even in second-line treatment. However, trastuzumab-deruxtecan has become a new standard. Despite the benefits of these antidrug conjugates, this benefit in patients with brain metastases remains unclear. Tucatinib is a new tyrosine kinase inhibitor that has given hope for the treatment of these patients. The objective of this article was to review data on the established drugs and novel agents for HER2-positive MBC and to discuss how to incorporate anti-HER2 therapies in first and later-line settings.
Insights
New treatments like trastuzumab-deruxtecan offer hope for HER2-positive metastatic breast cancer (MBC). Research is ongoing to clarify their effectiveness, especially for brain metastases, and to integrate new therapies like tucatinib.
Area of Science:
- Oncology
- Medical Research
Background:
- HER2 receptor overexpression in breast cancer is linked to poor prognosis and brain metastases.
- Current standards for HER2-positive metastatic breast cancer (MBC) include anti-HER2 double blockade, taxane, and trastuzumab emtansine (T-DM1).
- Newer agents like trastuzumab-deruxtecan have shown improved survival, becoming a new standard of care.
Purpose of the Study:
- To review established and novel anti-HER2 therapies for HER2-positive MBC.
- To discuss the efficacy of current treatments, including antibody-drug conjugates, in patients with brain metastases.
- To explore optimal integration of anti-HER2 therapies in first and later-line settings.
Main Methods:
- Literature review of established drugs and novel agents for HER2-positive MBC.
- Analysis of clinical data regarding treatment outcomes, particularly for patients with brain metastases.
- Discussion of therapeutic strategies and treatment sequencing.
Main Results:
- Trastuzumab-deruxtecan has demonstrated improved overall survival in second-line treatment for HER2-positive MBC.
- The benefit of antibody-drug conjugates, including trastuzumab-deruxtecan, in patients with brain metastases requires further clarification.
- Tucatinib, a novel tyrosine kinase inhibitor, shows promise for treating patients with brain metastases.
Conclusions:
- Established and novel anti-HER2 therapies are evolving for HER2-positive MBC.
- Further research is needed to establish the role of new agents in patients with brain metastases.
- Personalized treatment strategies are crucial for optimizing outcomes in HER2-positive MBC.
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