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Albanell J, Pérez-García JM, Gil-Gil M, Curigliano G, Ruíz-Borrego M, Comerma L, Gibert J, Bellet M, Bermejo B, Calvo L, de la Haba J, Espinosa E, Minisini AM, Quiroga V, Santaballa Bertran A, Mina L, Bellosillo B, Rojo F, Menéndez S, Sampayo-Cordero M, Popa C, Malfettone A, Cortés J, Llombart-Cussac A. Palbociclib Rechallenge for Hormone Receptor-Positive/HER-Negative Advanced Breast Cancer: Findings from the Phase II BioPER Trial. Clin Cancer Res 2023; 29:67-80. [PMID: 36165912 PMCID: PMC9811162 DOI: 10.1158/1078-0432.ccr-22-1281] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 06/27/2022] [Accepted: 09/21/2022] [Indexed: 02/06/2023]
Abstract
PURPOSE To assess the efficacy and exploratory biomarkers of continuing palbociclib plus endocrine therapy (ET) beyond progression on prior palbociclib-based regimen in patients with hormone receptor-positive/HER2-negative (HR+/HER2-) advanced breast cancer (ABC). PATIENTS AND METHODS The multicenter, open-label, phase II BioPER trial included women who had experienced a progressive disease (PD) after having achieved clinical benefit on the immediately prior palbociclib plus ET regimen. Palbociclib (125 mg, 100 mg, or 75 mg daily orally for 3 weeks and 1 week off as per prior palbociclib-based regimen) plus ET of physician's choice were administered in 4-week cycles until PD or unacceptable toxicity. Coprimary endpoints were clinical benefit rate (CBR) and percentage of tumors with baseline loss of retinoblastoma (Rb) protein expression. Additional endpoints included safety and biomarker analysis. RESULTS Among 33 patients enrolled, CBR was 34.4% [95% confidence interval (CI), 18.6-53.2; P < 0.001] and 13.0% of tumors (95% CI, 5.2-27.5) showed loss of Rb protein expression, meeting both coprimary endpoints. Median progression-free survival was 2.6 months (95% CI, 1.8-6.7). No new safety signals were reported. A signature that included baseline mediators of therapeutic resistance to palbociclib and ET (low Rb score, high cyclin E1 score, ESR1 mutation) was independently associated with shorter median progression-free survival (HR, 22.0; 95% CI, 1.71-282.9; P = 0.018). CONCLUSIONS Maintaining palbociclib after progression on prior palbociclib-based regimen seems to be a reasonable, investigational approach for selected patients. A composite biomarker signature predicts a subset of patients who may not derive a greater benefit from palbociclib rechallenge, warranting further validation in larger randomized controlled trials.
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Affiliation(s)
- Joan Albanell
- Medical Oncology Department, Hospital del Mar, Barcelona, Spain.,Cancer Research Program, IMIM (Hospital del Mar Medical Research Institute), Barcelona, Spain.,Centro de Investigación Biomédica en Red de Oncología (CIBERONC-ISCIII), Madrid, Spain.,Universitat Pompeu Fabra, Barcelona, Spain.,GEICAM, Spain
| | - José Manuel Pérez-García
- International Breast Cancer Center (IBCC), Quironsalud Group, Barcelona, Spain.,Medica Scientia Innovation Research (MEDSIR), Barcelona, Spain and Ridgewood, New Jersey
| | - Miguel Gil-Gil
- GEICAM, Spain.,Catalan Institute of Oncology, Breast Cancer Unit, Medical Oncology Department, IDIBELL, Barcelona, Spain
| | - Giuseppe Curigliano
- Istituto Europeo di Oncologia, IRCCS, Milano, Italy.,University of Milano, Department of Oncology and Hemato-Oncology, Milano, Italy
| | | | - Laura Comerma
- Cancer Research Program, IMIM (Hospital del Mar Medical Research Institute), Barcelona, Spain.,Pathology Department, Hospital del Mar, Barcelona, Spain
| | - Joan Gibert
- Cancer Research Program, IMIM (Hospital del Mar Medical Research Institute), Barcelona, Spain.,Pathology Department, Hospital del Mar, Barcelona, Spain
| | - Meritxell Bellet
- Vall d´Hebrón University Hospital, Barcelona, Spain.,Vall d´Hebrón Institute of Oncology (VHIO), Barcelona, Spain
| | - Begoña Bermejo
- Centro de Investigación Biomédica en Red de Oncología (CIBERONC-ISCIII), Madrid, Spain.,GEICAM, Spain.,Medical Oncology, Hospital Clínico Universitario de Valencia, Biomedical Research Institute INCLIVA, Valencia; Medicine Department, Universidad de Valencia, Valencia, Spain
| | - Lourdes Calvo
- GEICAM, Spain.,Complejo Hospitalario Universitario A Coruña (CHUAC), La Coruña, Spain
| | | | | | | | - Vanesa Quiroga
- Badalona-Applied Research Group in Oncology (B-ARGO Group), Catalan Institute of Oncology, Badalona, Barcelona, Spain
| | | | - Leonardo Mina
- Medica Scientia Innovation Research (MEDSIR), Barcelona, Spain and Ridgewood, New Jersey
| | - Beatriz Bellosillo
- Cancer Research Program, IMIM (Hospital del Mar Medical Research Institute), Barcelona, Spain.,Centro de Investigación Biomédica en Red de Oncología (CIBERONC-ISCIII), Madrid, Spain.,Universitat Pompeu Fabra, Barcelona, Spain.,Pathology Department, Hospital del Mar, Barcelona, Spain
| | - Federico Rojo
- Centro de Investigación Biomédica en Red de Oncología (CIBERONC-ISCIII), Madrid, Spain.,GEICAM, Spain.,IIS-Hospital Universitario Fundación Jiménez Díaz, Madrid, Spain
| | - Silvia Menéndez
- Cancer Research Program, IMIM (Hospital del Mar Medical Research Institute), Barcelona, Spain
| | - Miguel Sampayo-Cordero
- Medica Scientia Innovation Research (MEDSIR), Barcelona, Spain and Ridgewood, New Jersey
| | - Crina Popa
- Medica Scientia Innovation Research (MEDSIR), Barcelona, Spain and Ridgewood, New Jersey
| | - Andrea Malfettone
- Medica Scientia Innovation Research (MEDSIR), Barcelona, Spain and Ridgewood, New Jersey
| | - Javier Cortés
- International Breast Cancer Center (IBCC), Quironsalud Group, Barcelona, Spain.,Medica Scientia Innovation Research (MEDSIR), Barcelona, Spain and Ridgewood, New Jersey.,Universidad Europea de Madrid, Faculty of Biomedical and Health Sciences, Department of Medicine, Madrid, Spain
| | - Antonio Llombart-Cussac
- Medica Scientia Innovation Research (MEDSIR), Barcelona, Spain and Ridgewood, New Jersey.,Hospital Arnau de Vilanova, Valencia, Spain.,Universidad Catolica, Valencia, Spain.,Corresponding Author: Antonio Llombart-Cussac, Hospital Arnau de Vilanova, Calle de Sant Clement, 12, 46015, Valencia, Spain. Phone: 0034-961-976-060; E-mail:
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