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Data from the phase II PERTAIN trial presented late last year at the 2016 San Antonio Breast Cancer Symposium showed that adding an aromatase inhibitor (AI) to pertuzumab and trastuzumab extended progression-free survival by over 3 months versus trastuzumab plus an AI in patients with HER2-positive, HR-positive locally advanced or metastatic breast cancer.

Alberto J. Montero, MD, Department of Hematology and Oncology at Cleveland Clinic, discusses the PERTAIN study in postmenopausal women with hormone receptor-positive, HER2-positive, locally advanced or metastatic breast cancer. The study looks at the impact of adding pertuzumab (Perjeta) to trastuzumab (Herceptin) in aromatase inhibitor (AI) therapy.

The phase II HERMIONE trial was halted after the antibody-drug conjugate MM-302 combined with trastuzumab failed to improve progression-free survival versus chemotherapy plus trastuzumab in patients with HER2-positive metastatic breast cancer who had previously received trastuzumab, pertuzumab, and ado-trastuzumab emtansine.