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Pfizer Announces Topline Results From Phase 3 HER2CLIMB-05 Trial Of First-Line Combination Therapy With Tyrosine Kinase Inhibitor TUKYSA In Patients With HER2+ MBC

Author: Benzinga Newsdesk | October 14, 2025 05:46am

Pfizer Inc. (NYSE:PFE) today announced positive topline results from the Phase 3 HER2CLIMB-05 trial of first-line combination therapy with the tyrosine kinase inhibitor TUKYSA® (tucatinib) in patients with human epidermal growth factor receptor 2-positive (HER2+) metastatic breast cancer (MBC). HER2CLIMB-05 is evaluating TUKYSA versus placebo, both in combination with first-line standard-of-care maintenance therapy (trastuzumab plus pertuzumab) following chemotherapy-based induction. The trial met its primary endpoint, demonstrating a statistically significant and clinically meaningful improvement in progression-free survival (PFS) by investigator assessment in the TUKYSA arm versus the placebo arm. Treatment with TUKYSA in combination with trastuzumab and pertuzumab was tolerable, with a safety profile generally consistent with the established safety profiles of each individual therapy.


 

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