Pfizer announces Phase 3 PATINA study in patients with HR+, HER2+ metastatic breast cancer

IBRANCE is the first CDK4/6 inhibitor to show benefit in a large Phase 3 trial in first-line HR+, HER2+ metastatic breast cancer, in combination with anti-HER2 and endocrine therapy

Pfizer and Alliance Foundation Trials announced results from the Phase 3 PATINA trial demonstrating that the addition of IBRANCE (palbociclib) to current standard-of-care first-line maintenance therapy (following induction chemotherapy) resulted in statistically significant and clinically meaningful improvement in progression-free survival (PFS) by investigator assessment in patients with hormone receptor-positive (HR+), human epidermal growth factor receptor 2-positive (HER2+) metastatic breast cancer (MBC).

“PATINA is the first large Phase 3 study to show the benefit of CDK4/6 inhibition in HR-positive, HER2-positive metastatic breast cancer,” said Otto Metzger, M.D., principal investigator of the trial for Alliance Foundation Trials and Medical Oncologist at the Dana-Farber Cancer Institute. “These results support the potential of this maintenance treatment to slow disease progression and improve clinical outcomes in this patient population.”

Approximately 10% of all breast cancers are HR+, HER2+i, which is sometimes referred to as double-positive or triple-positive breast cancer. Despite advances in treatment, the development of resistance to anti-HER2 and endocrine therapy is a challenge, and novel therapeutic approaches are needed for HR+, HER2+ MBC.ii IBRANCE is not currently indicated for HR+, HER2+ MBC.

“IBRANCE, the first CDK4/6 inhibitor, revolutionized the treatment of HR-positive, HER2-negative metastatic breast cancer, and has been prescribed to over 773,000 patients since its initial approval in 2015,” said Roger Dansey, M.D., Chief Development Officer, Oncology, Pfizer. “These results demonstrate that the addition of IBRANCE to standard of care shows promise as maintenance therapy in HR-positive, HER2-positive disease. PATINA underscores Pfizer’s ongoing commitment to addressing the unmet needs of people with breast cancer, and we look forward to discussing the results with regulatory authorities.”