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Real-World Evidence Supports Effectiveness Combination Therapy in HR+, HER2- Metastatic Breast Cancer

March 25, 2021 • 6:29 am CDT
(Vax Before Cancer)

New York-based Pfizer Inc. announced today real-world evidence (RWE) demonstrating that first-line therapy with IBRANCE® (palbociclib) in combination with letrozole was associated with improved real-world progression-free survival (rwPFS) and overall survival (OS) in women with hormone receptor-positive (HR+), human epidermal growth factor 2-negative (HER2-) metastatic breast cancer (mBC) compared with letrozole alone.

This analysis showed the two-year OS rate was 78.3% in the IBRANCE group and 68.0% with letrozole. The rwPFS and OS benefits were generally consistent across all subgroups, including younger patients (18-50 years of age) and site or extent of metastases.

IBRANCE is an oral inhibitor of CDKs 4 and 6, which are key regulators of the cell cycle that trigger cellular progression.

These findings represent the first comprehensive comparative effectiveness analysis of survival outcomes for a CDK 4/6 inhibitor in routine clinical practice and were published online in Breast Cancer Research.

Chris Boshoff, M.D., Ph.D., Chief Development Officer, Oncology, Pfizer Global Product Development, stated in a press release, “With more than six years of patient experience, a positive benefit-risk profile, strong clinical data, and robust real-world data, the totality of evidence solidifies the role of IBRANCE plus endocrine therapy as a treatment for patients with HR+, HER2- metastatic breast cancer.”

Since the U.S. Food and Drug Administration's initial approval more than six years ago, IBRANCE has been prescribed to more than 380,000 patients across more than 100 countries.

Pfizer Oncology is committed to advancing medicines wherever we believe we can make a meaningful difference in the lives of people living with cancer. Today, we have an industry-leading portfolio of 24 approved innovative cancer medicines and biosimilars across more than 30 indications, including breast, genitourinary, colorectal, blood, and lung cancers, as well as melanoma.

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