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Cristofanilli M, Rugo HS, Im SA, Slamon DJ, Harbeck N, Bondarenko I, Masuda N, Colleoni M, DeMichele A, Loi S, Iwata H, O'Leary B, André F, Loibl S, Bananis E, Liu Y, Huang X, Kim S, Lechuga Frean MJ, Turner NC. Overall Survival with Palbociclib and Fulvestrant in Women with HR+/HER2- ABC: Updated Exploratory Analyses of PALOMA-3, a Double-blind, Phase III Randomized Study. Clin Cancer Res 2022; 28:3433-3442. [PMID: 35552673 PMCID: PMC9662922 DOI: 10.1158/1078-0432.ccr-22-0305] [Citation(s) in RCA: 58] [Impact Index Per Article: 29.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 04/01/2022] [Accepted: 05/09/2022] [Indexed: 01/07/2023]
Abstract
PURPOSE To conduct an updated exploratory analysis of overall survival (OS) with a longer median follow-up of 73.3 months and evaluate the prognostic value of molecular analysis by circulating tumor DNA (ctDNA). PATIENTS AND METHODS Patients with hormone receptor-positive/human epidermal growth factor receptor 2-negative (HR+/HER2-) advanced breast cancer (ABC) were randomized 2:1 to receive palbociclib (125 mg orally/day; 3/1 week schedule) and fulvestrant (500 mg intramuscularly) or placebo and fulvestrant. This OS analysis was performed when 75% of enrolled patients died (393 events in 521 randomized patients). ctDNA analysis was performed among patients who provided consent. RESULTS At the data cutoff (August 17, 2020), 258 and 135 deaths occurred in the palbociclib and placebo groups, respectively. The median OS [95% confidence interval (CI)] was 34.8 months (28.8-39.9) in the palbociclib group and 28.0 months (23.5-33.8) in the placebo group (stratified hazard ratio, 0.81; 95% CI, 0.65-0.99). The 6-year OS rate (95% CI) was 19.1% (14.9-23.7) and 12.9% (8.0-19.1) in the palbociclib and placebo groups, respectively. Favorable OS with palbociclib plus fulvestrant compared with placebo plus fulvestrant was observed in most subgroups, particularly in patients with endocrine-sensitive disease, no prior chemotherapy for ABC and low circulating tumor fraction and regardless of ESR1, PIK3CA, or TP53 mutation status. No new safety signals were identified. CONCLUSIONS The clinically meaningful improvement in OS associated with palbociclib plus fulvestrant was maintained with >6 years of follow-up in patients with HR+/HER2- ABC, supporting palbociclib plus fulvestrant as a standard of care in these patients.
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Affiliation(s)
- Massimo Cristofanilli
- Weill Cornell Medicine, New York, New York
- Corresponding Author: Massimo Cristofanilli, Medicine-Hematology & Oncology, Weill Cornell Medicine, 420 E 70th St, New York, NY 10021. Phone: 646-962-2330; E-mail:
| | - Hope S. Rugo
- University of California San Francisco Helen Diller Family Comprehensive Cancer Center, San Francisco, California
| | - Seock-Ah Im
- Seoul National University Hospital, Cancer Research Institute, Seoul National University College of Medicine, Seoul, Republic of South Korea
| | - Dennis J. Slamon
- David Geffen School of Medicine at University of California Los Angeles, Santa Monica, California
| | - Nadia Harbeck
- Brustzentrum, Frauenklinik and CCC Munich, LMU University Hospital, Munich, Germany
| | - Igor Bondarenko
- Dnipropetrovsk Medical Academy, City Multiple-Discipline Clinical Hospital #4, Dnipropetrovsk, Ukraine
| | - Norikazu Masuda
- Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, Japan
| | | | - Angela DeMichele
- Abramson Cancer Center, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Sherene Loi
- Peter MacCallum Cancer Centre, University of Melbourne, Melbourne, Victoria, Australia
| | - Hiroji Iwata
- Aichi Cancer Center Hospital, Chikusa-ku, Nagoya, Japan
| | - Ben O'Leary
- Royal Marsden Hospital and Institute of Cancer Research, London, United Kingdom
| | | | | | | | - Yuan Liu
- Pfizer Inc, San Diego, California
| | | | | | | | - Nicholas C. Turner
- Royal Marsden Hospital and Institute of Cancer Research, London, United Kingdom
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Loibl S, Marmé F, Martin M, Untch M, Bonnefoi H, Kim SB, Bear H, McCarthy N, Melé Olivé M, Gelmon K, García-Sáenz J, Kelly CM, Reimer T, Toi M, Rugo HS, Denkert C, Gnant M, Makris A, Koehler M, Huang-Bartelett C, Lechuga Frean MJ, Colleoni M, Werutsky G, Seiler S, Burchardi N, Nekljudova V, von Minckwitz G. Palbociclib for Residual High-Risk Invasive HR-Positive and HER2-Negative Early Breast Cancer-The Penelope-B Trial. J Clin Oncol 2021; 39:1518-1530. [PMID: 33793299 DOI: 10.1200/jco.20.03639] [Citation(s) in RCA: 143] [Impact Index Per Article: 47.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
PURPOSE About one third of patients with hormone receptor-positive, human epidermal growth factor receptor 2-negative breast cancer who have residual invasive disease after neoadjuvant chemotherapy (NACT) will relapse. Thus, additional therapy is needed. Palbociclib is a cyclin-dependent kinase 4 and 6 inhibitor demonstrating efficacy in the metastatic setting. PATIENTS AND METHODS PENELOPE-B (NCT01864746) is a double-blind, placebo-controlled, phase III study in women with hormone receptor-positive, human epidermal growth factor receptor 2-negative primary breast cancer without a pathological complete response after taxane-containing NACT and at high risk of relapse (clinical pathological staging-estrogen receptor grading score ≥ 3 or 2 and ypN+). Patients were randomly assigned (1:1) to receive 13 cycles of palbociclib 125 mg once daily or placebo on days 1-21 in a 28-day cycle in addition to endocrine therapy (ET). Primary end point is invasive disease-free survival (iDFS). Final analysis was planned after 290 iDFS events with a two-sided efficacy boundary P < .0463 because of two interim analyses. RESULTS One thousand two hundred fifty patients were randomly assigned. The median age was 49.0 years (range, 19-79), and the majority were ypN+ with Ki-67 ≤ 15%; 59.4% of patients had a clinical pathological staging-estrogen receptor grading score ≥ 3. 50.1% received aromatase inhibitor, and 33% of premenopausal women received a luteinizing hormone releasing hormone analog in addition to either tamoxifen or an aromatase inhibitor. After a median follow-up of 42.8 months (92% complete), 308 events were confirmed. Palbociclib did not improve iDFS versus placebo added to ET-stratified hazard ratio, 0.93 (95% repeated CI, 0.74 to 1.17) and two-sided weighted log-rank test (Cui, Hung, and Wang) P = .525. There was no difference among the subgroups. Most common related serious adverse events were infections and vascular disorders in 113 (9.1%) patients with no difference between the treatment arms. Eight fatal serious adverse events (two palbociclib and six placebo) were reported. CONCLUSION Palbociclib for 1 year in addition to ET did not improve iDFS in women with residual invasive disease after NACT.
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Affiliation(s)
- Sibylle Loibl
- German Breast Group, Neu-Isenburg, Germany.,Center for Hematology and Oncology Bethanien, Frankfurt, Germany
| | - Frederik Marmé
- Department of Gynaecology and Obstetrics, University Hospital Mannheim, Mannheim, Germany
| | - Miguel Martin
- Instituto de Investigacion Sanitaria Gregorio Marañon, CIBERONC, Universidad Complutense, Madrid, Spain.,GEICAM, Madrid, Spain
| | - Michael Untch
- Department of Gynaecology and Obstetrics, Breast Cancer Center, HELIOS Klinikum Berlin Buch, Berlin, Germany
| | - Hervé Bonnefoi
- UCBG (Unicancer Breast Cancer Group) and Institut Bergonié, Université de Bordeaux, Bordeaux, France
| | - Sung-Bae Kim
- Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea, and KCSG (Korean Cancer Study Group), Korea
| | - Harry Bear
- Division of Surgical Oncology, Massey Cancer Center, Virginia Commonwealth University, VCU Health, Richmond, VA.,NSABP Foundation, Pittsburgh, PA
| | - Nicole McCarthy
- Breast Cancer Trials Australia and New Zealand, Newcastle, Australia
| | - Mireia Melé Olivé
- GEICAM, Madrid, Spain.,Oncology Research Group, Hospital Universitario Sant Joan de Reus, Reus, Spain
| | - Karen Gelmon
- BC Cancer Agency, Vancouver, British Columbia, Canada
| | - José García-Sáenz
- GEICAM, Madrid, Spain.,Instituto de Investigación Sanitaria Hospital Clinico San Carlos (IdISSC), Madrid, Spain
| | - Catherine M Kelly
- Mater Misericordiae University Hospital and Breast Group, Cancer Trials, Dublin, Ireland
| | - Toralf Reimer
- Department of Obstetrics and Gynecology, University of Rostock, Rostock, Germany
| | - Masakazu Toi
- Breast Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Hope S Rugo
- Breast Department, UCSF Helen Diller Family Comprehensive Cancer Center, San Francisco, CA
| | - Carsten Denkert
- German Breast Group, Neu-Isenburg, Germany.,Institute of Pathology, University Hospital Marburg and Philipps-Universität Marburg, Germany
| | - Michael Gnant
- Comprehensive Cancer Center, Medical University of Vienna, Vienna, Austria.,ABCSG, Vienna, Austria
| | | | | | | | | | - Marco Colleoni
- IEO, European Institute of Oncology, IRCCS, Milan, Italy
| | - Gustavo Werutsky
- Latin American Cooperative Oncology Group (LACOG), Porto Alegre, Brazil
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