ArticleFrontiers in oncology2022
Real-World Effectiveness of Palbociclib Plus Letrozole vs Letrozole Alone for Metastatic Breast Cancer With Lung or Liver Metastases: Flatiron Database Analysis.
Article in Frontiers in oncology, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT04176354 (Real-world Treatment Patterns and Effectiveness of Palbociclib in Combination With an Aromatase Inhibitor as Initial Endocrine Based Therapy in Metastatic/Advanced Breast Cancer), which is not on this map. Cited by 8 papers, 1 of them a synthesis that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Real-world Treatment Patterns and Effectiveness of Palbociclib in Combination With an Aromatase Inhibitor as Initial Endocrine Based Therapy in Metastatic/Advanced Breast Cancer
Who cites it
8 citing papers in PubMed, 1 synthesis or guideline pooled it, 11 citations in OpenAlex.
- Palbociclib treatment in patients with HR+/HER2- advanced or metastatic breast cancer and visceral metastasis: A systematic literature review.Breast (Edinburgh, Scotland) · 2025Pooled it
- CDK4/6 inhibitor combined with endocrine therapy: a real-world evaluation of efficacy and safety in HR+/HER2- advanced breast cancer.World journal of surgical oncology · 2026Article
- Real-world effectiveness of CDK4/6i in first-line treatment of HR+/HER2- advanced/metastatic breast cancer: updated systematic review.Frontiers in oncology · 2025Review
- Article
- Retrospective registry of patients with locally advanced/metastatic HRClinical & translational oncology : official publication of the Federation of Spanish Oncology Societies and of the National Cancer Institute of Mexico · 2024Article
- Real-world effectiveness of palbociclib in HR+/HER2- metastatic breast cancer: a literature review.Future science OA · 2024Review
- Article
- Real-World Effectiveness of Palbociclib Plus Aromatase Inhibitors in African American Patients With Metastatic Breast Cancer.The oncologist · 2023Article
Corrections and comments
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Authors and funding
5 authors at 3 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Background: Cyclin-dependent kinase 4/6 inhibitors are a standard treatment for patients with hormone receptor-positive (HR+)/human epidermal growth factor receptor 2-negative (HER2-) metastatic breast cancer (MBC). However, real-world data on effectiveness in patients with liver or lung metastatic disease is limited. This study compared outcomes of palbociclib plus letrozole versus letrozole alone in patients with HR+/HER2- MBC with lung or liver metastasis treated in routine clinical practice in the United States. Methods: This retrospective analysis used Flatiron Health's database of electronic health records. Women with HR+/HER2- MBC and liver or lung metastasis received first-line palbociclib plus letrozole or letrozole alone between February 2015 and February 2019. Real-world progression-free survival (rwPFS) was defined as time from start of treatment to death or disease progression. Stabilized inverse probability treatment weighting (sIPTW) was used to balance baseline demographic and clinical characteristics between palbociclib plus letrozole versus letrozole cohorts. Cox proportional-hazards models were used to estimate the effectiveness of palbociclib plus letrozole versus letrozole alone in rwPFS and overall survival (OS). Results: The study included 353 patients with lung metastasis, 123 with liver metastasis, and 75 with both. After sIPTW, palbociclib plus letrozole versus letrozole alone was significantlly associated with prolonged rwPFS (hazard ratio (HR), 0.56) and OS (HR, 0.58) (both p<0.001) in all patients. Palbociclib plus letrozole compared with letrozole alone demonstrated a median rwPFS of 16.5 versus 10.5 months, respectively (adjusted HR, 0.52; Conclusions: In this real-world population, palbociclib in combination with letrozole is associated with improved outcomes compared with letrozole alone for patients with HR+/HER2- MBC and liver or lung metastasis in the first-line setting. The findings support first-line palbociclib in combination with an aromatase inhibitor as standard of care for HR+/HER2- MBC regardless of visceral disease. Clinical Trial Registration: NCT04176354.
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.