Therapeutic Response Statement (Sensitivity)

This therapeutic response statement supports the relationship that HER2-positive status confers therapeutic sensitivity to Pertuzumab, Trastuzumab deruxtecan in patients with Invasive Breast Carcinoma.

This statement is based on a regulatory approval from the Food and Drug Administration:

ENHERTU is a HER2-directed antibody and topoisomerase inhibitor conjugate indicated in combination with pertuzumab as first-line treatment of adult patients with unresectable or metastatic HER2-positive (IHC 3+ or ISH+) breast cancer, as determined by an FDA-approved test.

Citation

Daiichi Sankyo, Inc. Enhertu (trastuzumab deruxtecan) [package insert]. U.S. Food and Drug Administration website. https://www.accessdata.fda.gov/drugsatfda_docs/label/2025/761139s038s042lbl.pdf. Revised December 2025. Accessed December 24, 2025.