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New approaches for human epidermal growth factor receptor 2-low and human epidermal growth factor receptor 2-overexpressing metastatic breast cancer

Abstract

Purpose of review

In recent years, there has been a flurry of activity in the human epidermal growth factor receptor 2 (HER2)-positive metastatic breast cancer space. New, powerful drugs like trastuzumab deruxtecan have challenged our fundamental definition of what HER2 expression means as a predictive biomarker.

Recent findings

Recent approvals of multiple agents in the second line-metastatic setting have given patients access to a variety of new agents, but also raise questions with regard to optimal sequencing.

Summary

This review will explore current issues with HER2 testing, recently approved drugs in the HER2+ and HER2 low spaces, as well as novel agents/combinations on the horizon.

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