Promising breast cancer drug trial pulled before starting

NCT ID NCT06585969

First seen Feb 15, 2026 · Last updated Apr 30, 2026 · Updated 11 times

Summary

This study was designed to see if the drug trastuzumab deruxtecan works better than standard CDK4/6 inhibitors for people with a specific type of advanced breast cancer (ER-positive, HER2-low, non-luminal A). The trial was withdrawn before enrolling any participants, so no results are available. It would have involved adults with metastatic breast cancer that has spread beyond the breast.

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