Pertuzumab plus high-dose trastuzumab shows activity in HER-2-positive breast cancer

Key clinical point: In patients with human epidermal growth factor 2 (HER2)-positive metastatic breast cancer and progressive brain metastases despite radiotherapy, pertuzumab in combination with high-dose trastuzumab shows modest central nervous system (CNS) response and good clinical benefit.

Major finding: The confirmed CNS objective response rate was 11% with all partial responses. The clinical benefit rate at 4 months was 68% and at 6 months was 51%. The grade 3-4 adverse event rate was 44%. There were no new safety signals.

Study details: A phase 2 PATRICIA study evaluated pertuzumab in combination with high-dose trastuzumab in 39 patients with HER2-positive metastatic breast cancer and progressive brain metastases despite radiotherapy.

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Disclosures: The study was sponsored by F. Hoffmann-La Roche/ Genentech. The authors received consulting/advisory fees, research funding, royalties, and travel/accommodation expenses from various sources. Dr. Fung, Dr. Cheng, and Dr. Kirschbrown reported employment by, stocks, and other ownership interests in Genentech/Roche.

Source: Lin NU et al. J Clin Oncol. 2021 May 4. doi: 10.1200/JCO.20.02822.