Pfizer Inc. (NYSE:PFE) today announced overall survival (OS) results from the Phase 3 PALOMA-2 trial, which evaluated IBRANCE® (palbociclib) in combination with letrozole compared to placebo plus letrozole for the first-line treatment of postmenopausal women with estrogen receptor-positive (ER+), human epidermal growth factor receptor 2-negative (HER2-) metastatic breast cancer (mBC). With a median follow-up of 90 months, patients receiving IBRANCE in combination with letrozole had numerically longer OS compared to placebo plus letrozole (median (95% CI) 53.9 months (49.8–60.8) vs median 51.2 months (43.7–58.9)); the results were not statistically significant (Hazard Ratio (HR)=0.956 [95% CI, 0.777–1.177]). The PALOMA-2 trial was designed for a primary endpoint of progression-free survival (PFS) with OS as one of the secondary endpoints. The results will be presented today as an oral presentation at the American Society of Clinical Oncology (ASCO) 2022 Annual Meeting (LBA 1003).
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