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- W4304080647 abstract "Abstract Purpose: Sensitivity to endocrine therapy (ET) is critical for the clinical benefit from the combination of palbociclib plus ET in hormone receptor–positive/HER2-negative (HR+/HER2−) advanced breast cancer. Bazedoxifene is a third-generation selective estrogen receptor (ER) modulator and selective ER degrader with activity in preclinical models of endocrine-resistant breast cancer, including models harboring ESR1 mutations. Clinical trials in healthy women showed that bazedoxifene is well tolerated. Patients and Methods: We conducted a phase Ib/II study of bazedoxifene plus palbociclib in patients with HR+/HER2− advanced breast cancer who progressed on prior ET (N = 36; NCT02448771). Results: The study met its primary endpoint, with a clinical benefit rate of 33.3%, and the safety profile was consistent with what has previously been seen with palbociclib monotherapy. The median progression-free survival (PFS) was 3.6 months [95% confidence interval (CI), 2.0–7.2]. An activating PIK3CA mutation at baseline was associated with a shorter PFS (HR = 4.4; 95% CI, 1.5–13; P = 0.0026), but activating ESR1 mutations did not impact the PFS. Longitudinal plasma circulating tumor DNA whole-exome sequencing (WES; N = 68 plasma samples) provided an overview of the tumor heterogeneity and the subclonal genetic evolution, and identified actionable mutations acquired during treatment. Conclusions: The combination of palbociclib and bazedoxifene has clinical efficacy and an acceptable safety profile in a heavily pretreated patient population with advanced HR+/HER2− breast cancer. These results merit continued investigation of bazedoxifene in breast cancer." @default.
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- W4304080647 date "2022-10-10" @default.
- W4304080647 modified "2023-10-03" @default.
- W4304080647 title "Clinical Efficacy and Whole-Exome Sequencing of Liquid Biopsies in a Phase IB/II Study of Bazedoxifene and Palbociclib in Advanced Hormone Receptor–Positive Breast Cancer" @default.
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- W4304080647 doi "https://doi.org/10.1158/1078-0432.ccr-22-2305" @default.
- W4304080647 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36215125" @default.
- W4304080647 hasPublicationYear "2022" @default.
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