CC BY-NC-ND 4.0 · Geburtshilfe Frauenheilkd 2024; 84(05): 443-458
DOI: 10.1055/a-2286-6066
GebFra Science
Review/Übersicht

CDK4/6 Inhibition – Therapy Sequences and the Quest to Find the Best Biomarkers – an Overview of Current Programs

Artikel in mehreren Sprachen: English | deutsch
Andreas Schneeweiss
1   National Center for Tumor Diseases, University Hospital and German Cancer Research Center, Heidelberg, Germany
,
Sara Y. Brucker
2   Department of Gynecology and Obstetrics, Tübingen University Hospital, Tübingen, Germany
,
Hanna Huebner
3   Department of Gynecology and Obstetrics, Universitätsklinikum Erlangen, Comprehensive Cancer Center Erlangen-EMN (CCC ER-EMN) Friedrich-Alexander-Universität Erlangen Nürnberg, Erlangen, Germany
,
Lea L. Volmer
2   Department of Gynecology and Obstetrics, Tübingen University Hospital, Tübingen, Germany
,
Carolin C. Hack
3   Department of Gynecology and Obstetrics, Universitätsklinikum Erlangen, Comprehensive Cancer Center Erlangen-EMN (CCC ER-EMN) Friedrich-Alexander-Universität Erlangen Nürnberg, Erlangen, Germany
,
Katharina Seitz
3   Department of Gynecology and Obstetrics, Universitätsklinikum Erlangen, Comprehensive Cancer Center Erlangen-EMN (CCC ER-EMN) Friedrich-Alexander-Universität Erlangen Nürnberg, Erlangen, Germany
,
Matthias Ruebner
3   Department of Gynecology and Obstetrics, Universitätsklinikum Erlangen, Comprehensive Cancer Center Erlangen-EMN (CCC ER-EMN) Friedrich-Alexander-Universität Erlangen Nürnberg, Erlangen, Germany
,
Sabine Heublein
1   National Center for Tumor Diseases, University Hospital and German Cancer Research Center, Heidelberg, Germany
,
Verena Thewes
1   National Center for Tumor Diseases, University Hospital and German Cancer Research Center, Heidelberg, Germany
,
Diana Lüftner
4   Immanuel Hospital Märkische Schweiz & Immanuel Campus Rüdersdorf, Medical University of Brandenburg Theodor-Fontane, Rüdersdorf bei Berlin, Germany
,
Michael P. Lux
5   Department of Gynecology and Obstetrics, Frauenklinik St. Louise, Paderborn, St. Josefs-Krankenhaus, Salzkotten, Germany; St. Vincenz Kliniken Salzkotten + Paderborn, Paderborn, Germany
,
Ingolf Jurhasz-Böss
6   Department of Obstetrics and Gynecology, University Medical Center Freiburg, Freiburg, Germany
,
Florin-Andrei Taran
6   Department of Obstetrics and Gynecology, University Medical Center Freiburg, Freiburg, Germany
,
Pauline Wimberger
7   Department of Gynecology and Obstetrics, Carl Gustav Carus Faculty of Medicine and University Hospital, TU Dresden, Dresden, Germany
8   National Center for Tumor Diseases (NCT), Dresden, Germany; German Cancer Research Center (DKFZ), Heidelberg, Germany; Carl Gustav Carus Faculty of Medicine and University Hospital, TU Dresden, Dresden, Germany; Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Dresden, Germany
9   German Cancer Consortium (DKTK), Dresden, Germany; German Cancer Research Center (DKFZ), Heidelberg, Germany
,
Daniel Anetsberger
3   Department of Gynecology and Obstetrics, Universitätsklinikum Erlangen, Comprehensive Cancer Center Erlangen-EMN (CCC ER-EMN) Friedrich-Alexander-Universität Erlangen Nürnberg, Erlangen, Germany
,
Milena Beierlein
3   Department of Gynecology and Obstetrics, Universitätsklinikum Erlangen, Comprehensive Cancer Center Erlangen-EMN (CCC ER-EMN) Friedrich-Alexander-Universität Erlangen Nürnberg, Erlangen, Germany
,
Marcus Schmidt
10   Department of Gynecology and Obstetrics, University Hospital Mainz, Mainz, Germany
,
Julia Radosa
11   Department of Gynecology and Obstetrics, University Hospital Saarland, Homburg, Germany
,
Volkmar Müller
12   Department of Gynecology, Hamburg-Eppendorf University Medical Center, Hamburg, Germany
,
Wolfgang Janni
13   Department of Gynecology and Obstetrics, Ulm University Hospital, Ulm, Germany
,
Brigitte Rack
13   Department of Gynecology and Obstetrics, Ulm University Hospital, Ulm, Germany
,
Erik Belleville
14   ClinSol GmbH & Co KG, Würzburg, Germany
,
Michael Untch
15   Clinic for Gynecology and Obstetrics, Breast Cancer Center, Gynecologic Oncology Center, Helios Klinikum Berlin Buch, Berlin, Germany
,
Marc Thill
16   Agaplesion Markus Krankenhaus, Department of Gynecology and Gynecological Oncology, Frankfurt, Germany
,
Nina Ditsch
17   Department of Gynecology and Obstetrics, University Hospital Augsburg, Augsburg, Germany
,
Bahriye Aktas
18   Department of Gynecology, University Hospital Leipzig, Leipzig, Germany
,
Ivonne Nel
18   Department of Gynecology, University Hospital Leipzig, Leipzig, Germany
,
Hans-Christian Kolberg
19   Department of Gynecology and Obstetrics, Marienhospital Bottrop, Bottrop, Germany
,
Tobias Engerle
2   Department of Gynecology and Obstetrics, Tübingen University Hospital, Tübingen, Germany
,
Hans Tesch
20   Oncology Practice at Bethanien Hospital, Frankfurt am Main, Germany
,
Christian Roos
21   Novartis Pharma GmbH, Nuremberg, Germany
,
Christina Budden
21   Novartis Pharma GmbH, Nuremberg, Germany
,
Hans Neubauer
22   Department of Gynecology and Obstetrics, University Hospital Düsseldorf, Düsseldorf, Germany
,
Andreas D. Hartkopf
2   Department of Gynecology and Obstetrics, Tübingen University Hospital, Tübingen, Germany
,
Tanja N. Fehm
22   Department of Gynecology and Obstetrics, University Hospital Düsseldorf, Düsseldorf, Germany
23   Centrum für Integrierte Onkologie, Aachen Bonn Köln Düsseldorf, Düsseldorf, Germany
,
Peter A. Fasching
3   Department of Gynecology and Obstetrics, Universitätsklinikum Erlangen, Comprehensive Cancer Center Erlangen-EMN (CCC ER-EMN) Friedrich-Alexander-Universität Erlangen Nürnberg, Erlangen, Germany
› Institutsangaben

Abstract

In recent years, new targeted therapies have been developed to treat patients with hormone receptor-positive (HR+)/human epidermal growth factor receptor 2-negative (HER2−) breast cancer. Some of these therapies have not just become the new therapy standard but also led to significantly longer overall survival rates. The cyclin-dependent kinase 4 and 6 inhibitors (CDK4/6i) have become the therapeutic standard for first-line therapy. Around 70 – 80% of patients are treated with a CDK4/6i. In recent years, a number of biomarkers associated with progression, clonal selection or evolution have been reported for CDK4/6i and their endocrine combination partners. Understanding the mechanisms behind treatment efficacy and resistance is important. A better understanding could contribute to planning the most effective therapeutic sequences and utilizing basic molecular information to overcome endocrine resistance. One study with large numbers of patients which aims to elucidate these mechanisms is the Comprehensive Analysis of sPatial, TempORal and molecular patterns of ribociclib efficacy and resistance in advanced Breast Cancer patients (CAPTOR BC) trial. This overview summarizes the latest clinical research on resistance to endocrine therapies, focusing on CDK4/6 inhibitors and discussing current study concepts.



Publikationsverlauf

Eingereicht: 25. Dezember 2023

Angenommen nach Revision: 12. März 2024

Artikel online veröffentlicht:
29. Mai 2024

© 2024. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commecial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany

 
  • References/Literatur

  • 1 Finn RS, Dering J, Conklin D. et al. PD 0332991, a selective cyclin D kinase 4/6 inhibitor, preferentially inhibits proliferation of luminal estrogen receptor-positive human breast cancer cell lines in vitro. Breast Cancer Res 2009; 11: R77 DOI: 10.1186/bcr2419.
  • 2 Engler T, Fasching PA, Luftner D. et al. Implementation of CDK4/6 Inhibitors and its Influence on the Treatment Landscape of Advanced Breast Cancer Patients – Data from the Real-World Registry PRAEGNANT. Geburtshilfe Frauenheilkd 2022; 82: 1055-1067 DOI: 10.1055/a-1880-0087.
  • 3 Schneeweiss A, Ettl J, Luftner D. et al. Initial experience with CDK4/6 inhibitor-based therapies compared to antihormone monotherapies in routine clinical use in patients with hormone receptor positive, HER2 negative breast cancer – Data from the PRAEGNANT research network for the first 2 years of drug availability in Germany. Breast 2020; 54: 88-95 DOI: 10.1016/j.breast.2020.08.011.
  • 4 Thill M, Kolberg-Liedtke C, Albert US. et al. AGO Recommendations for the Diagnosis and Treatment of Patients with Locally Advanced and Metastatic Breast Cancer: Update 2023. Breast Care (Basel) 2023; 18: 306-315 DOI: 10.1159/000531579.
  • 5 Harbeck N, Rastogi P, Martin M. et al. Adjuvant abemaciclib combined with endocrine therapy for high-risk early breast cancer: updated efficacy and Ki-67 analysis from the monarchE study. Ann Oncol 2021; 32: 1571-1581 DOI: 10.1016/j.annonc.2021.09.015.
  • 6 Slamon D, Stroyakovskiy D, Yardley D. et al. Phase III NATALEE trial of ribociclib + endocrine therapy as adjuvant treatment in patients with HR+/HER2− early breast cancer. ASCO Annual Meeting 2023; 2023: LBA500
  • 7 Finn RS, Crown JP, Lang I. et al. The cyclin-dependent kinase 4/6 inhibitor palbociclib in combination with letrozole versus letrozole alone as first-line treatment of oestrogen receptor-positive, HER2-negative, advanced breast cancer (PALOMA-1/TRIO-18): a randomised phase 2 study. Lancet Oncol 2015; 16: 25-35 DOI: 10.1016/S1470-2045(14)71159-3.
  • 8 Turner NC, Ro J, Andre F. et al. Palbociclib in Hormone-Receptor-Positive Advanced Breast Cancer. N Engl J Med 2015; 373: 209-219 DOI: 10.1056/NEJMoa1505270.
  • 9 OʼLeary B, Cutts RJ, Liu Y. et al. The Genetic Landscape and Clonal Evolution of Breast Cancer Resistance to Palbociclib plus Fulvestrant in the PALOMA-3 Trial. Cancer Discov 2018; 8: 1390-1403 DOI: 10.1158/2159-8290.CD-18-0264.
  • 10 Tolaney SM, Toi M, Neven P. et al. Clinical Significance of PIK3CA and ESR1 Mutations in Circulating Tumor DNA: Analysis from the MONARCH 2 Study of Abemaciclib plus Fulvestrant. Clinical Cancer Research 2022; 28: 1500-1506 DOI: 10.1158/1078-0432.Ccr-21-3276.
  • 11 Prat A, Chaudhury A, Solovieff N. et al. Correlative Biomarker Analysis of Intrinsic Subtypes and Efficacy Across the MONALEESA Phase III Studies. J Clin Oncol 2021; 39: 1458-1467 DOI: 10.1200/JCO.20.02977.
  • 12 Andre F, Su F, Solovieff N. et al. Pooled ctDNA analysis of the MONALEESA (ML) phase III advanced breast cancer (ABC) trials. J Clin Oncol 2020; 38: 1009 DOI: 10.1200/JCO.2020.38.15_suppl.1009.
  • 13 Bianchini G, Malorni L, Arpino G. et al. Circulating tumor DNA (ctDNA) dynamics in patients with hormone receptor positive (HR+)/HER2 negative (HER2-) advanced breast cancer (aBC) treated in first line with ribociclib (R) and letrozole (L) in the BioItaLEE trial. San Antonio Breast Cancer Symposium 2021; 2021: GS3-07
  • 14 Bagegni N, Thomas S, Liu N. et al. Serum thymidine kinase 1 activity as a pharmacodynamic marker of cyclin-dependent kinase 4/6 inhibition in patients with early-stage breast cancer receiving neoadjuvant palbociclib. Breast Cancer Res 2017; 19: 123 DOI: 10.1186/s13058-017-0913-7.
  • 15 Malorni L, Bianchini G, Caputo R. et al. Serum thymidine kinase activity in patients with HR-positive/HER2-negative advanced breast cancer treated with ribociclib plus letrozole: Results from the prospective BioItaLEE trial. Eur J Cancer 2023; 186: 1-11 DOI: 10.1016/j.ejca.2023.03.001.
  • 16 Safonov A, Bandlamudi C, Tallón de Lara P. et al. Comprehensive genomic profiling of patients with breast cancer identifies germline-somatic interactions mediating therapy resistanc. San Antonio Breast Cancer Symposium 2021; 2021: GS4-08
  • 17 Marra A, Gazzo A, Gupta A. et al. Mutational signature analysis reveals patterns of genomic instability linked to resistance to endocrine therapy (ET) ± CDK 4/6 inhibition (CDK4/6i) in estrogen receptor-positive/HER2-negative (ER+/HER2-) metastatic breast cancer (MBC). Ann Oncol 2022; 33 (Suppl. 7) S88-S121 DOI: 10.1016/annonc/annonc1089.
  • 18 Alexandrov LB, Stratton MR. Mutational signatures: the patterns of somatic mutations hidden in cancer genomes. Curr Opin Genet Dev 2014; 24: 52-60 DOI: 10.1016/j.gde.2013.11.014.
  • 19 Alexandrov LB, Kim J, Haradhvala NJ. et al. The repertoire of mutational signatures in human cancer. Nature 2020; 578: 94-101 DOI: 10.1038/s41586-020-1943-3.
  • 20 COSMIC. Mutational Signatures (v3.3 – June 2022)- Single Base Substitution (SBS) Signatures. 2022 Online (Stand: 12.11.2022): https://cancer.sanger.ac.uk/signatures/sbs/
  • 21 Toy W, Weir H, Razavi P. et al. Activating ESR1 Mutations Differentially Affect the Efficacy of ER Antagonists. Cancer Discov 2017; 7: 277-287 DOI: 10.1158/2159-8290.CD-15-1523.
  • 22 Robinson DR, Wu YM, Vats P. et al. Activating ESR1 mutations in hormone-resistant metastatic breast cancer. Nat Genet 2013; 45: 1446-1451 DOI: 10.1038/ng.2823.
  • 23 Spoerke JM, Gendreau S, Walter K. et al. Heterogeneity and clinical significance of ESR1 mutations in ER-positive metastatic breast cancer patients receiving fulvestrant. Nat Commun 2016; 7: 11579 DOI: 10.1038/ncomms11579.
  • 24 Wang P, Bahreini A, Gyanchandani R. et al. Sensitive Detection of Mono- and Polyclonal ESR1 Mutations in Primary Tumors, Metastatic Lesions, and Cell-Free DNA of Breast Cancer Patients. Clin Cancer Res 2016; 22: 1130-1137 DOI: 10.1158/1078-0432.CCR-15-1534.
  • 25 Schiavon G, Hrebien S, Garcia-Murillas I. et al. Analysis of ESR1 mutation in circulating tumor DNA demonstrates evolution during therapy for metastatic breast cancer. Sci Transl Med 2015; 7: 313ra182 DOI: 10.1126/scitranslmed.aac7551.
  • 26 Zhang K, Hong R, Xu F. et al. Clinical value of circulating ESR1 mutations for patients with metastatic breast cancer: a meta-analysis. Cancer Manag Res 2018; 10: 2573-2580 DOI: 10.2147/CMAR.S173193.
  • 27 Fanning SW, Mayne CG, Dharmarajan V. et al. Estrogen receptor alpha somatic mutations Y537S and D538 G confer breast cancer endocrine resistance by stabilizing the activating function-2 binding conformation. Elife 2016; 5: e12792 DOI: 10.7554/eLife.12792.
  • 28 Fanning SW, Jeselsohn R, Dharmarajan V. et al. The SERM/SERD bazedoxifene disrupts ESR1 helix 12 to overcome acquired hormone resistance in breast cancer cells. Elife 2018; 7: e37161 DOI: 10.7554/eLife.37161.
  • 29 Bidard FC, Kaklamani VG, Neven P. et al. Elacestrant (oral selective estrogen receptor degrader) Versus Standard Endocrine Therapy for Estrogen Receptor-Positive, Human Epidermal Growth Factor Receptor 2-Negative Advanced Breast Cancer: Results From the Randomized Phase III EMERALD Trial. J Clin Oncol 2022; 40: 3246-3256 DOI: 10.1200/JCO.22.00338.
  • 30 Bidard FC, Hardy-Bessard AC, Dalenc F. et al. Switch to fulvestrant and palbociclib versus no switch in advanced breast cancer with rising ESR1 mutation during aromatase inhibitor and palbociclib therapy (PADA-1): a randomised, open-label, multicentre, phase 3 trial. Lancet Oncol 2022; 23: 1367-1377 DOI: 10.1016/S1470-2045(22)00555-1.
  • 31 Breast Cancer Association Consortium. Dorling L, Carvalho S, Allen J. et al. Breast Cancer Risk Genes – Association Analysis in More than 113,000 Women. N Engl J Med 2021; 384: 428-439 DOI: 10.1056/NEJMoa1913948.
  • 32 Fachal L, Aschard H, Beesley J. et al. Fine-mapping of 150 breast cancer risk regions identifies 191 likely target genes. Nat Genet 2020; 52: 56-73 DOI: 10.1038/s41588-019-0537-1.
  • 33 Garcia-Closas M, Couch FJ, Lindstrom S. et al. Genome-wide association studies identify four ER negative-specific breast cancer risk loci. Nat Genet 2013; 45: 392-398 398e1–398e2 DOI: 10.1038/ng.2561.
  • 34 Ghoussaini M, Fletcher O, Michailidou K. et al. Genome-wide association analysis identifies three new breast cancer susceptibility loci. Nat Genet 2012; 44: 312-318 DOI: 10.1038/ng.1049.
  • 35 Michailidou K, Beesley J, Lindstrom S. et al. Genome-wide association analysis of more than 120,000 individuals identifies 15 new susceptibility loci for breast cancer. Nat Genet 2015; 47: 373-380 DOI: 10.1038/ng.3242.
  • 36 Michailidou K, Hall P, Gonzalez-Neira A. et al. Large-scale genotyping identifies 41 new loci associated with breast cancer risk. Nat Genet 2013; 45: 353-361 361e1–361e2 DOI: 10.1038/ng.2563.
  • 37 Milne RL, Kuchenbaecker KB, Michailidou K. et al. Identification of ten variants associated with risk of estrogen-receptor-negative breast cancer. Nat Genet 2017; 49: 1767-1778 DOI: 10.1038/ng.3785.
  • 38 Michailidou K, Lindstrom S, Dennis J. et al. Association analysis identifies 65 new breast cancer risk loci. Nature 2017; 551: 92-94 DOI: 10.1038/nature24284.
  • 39 Fasching PA, Liu D, Scully S. et al. Identification of Two Genetic Loci Associated with Leukopenia after Chemotherapy in Breast Cancer Patients. Clin Cancer Res 2022; 28: 3342-3355 DOI: 10.1158/1078-0432.CCR-20-4774.
  • 40 Hlevnjak M, Schulze M, Elgaafary S. et al. CATCH: A Prospective Precision Oncology Trial in Metastatic Breast Cancer. JCO Precis Oncol 2021; 5: PO.20.00248 DOI: 10.1200/PO.20.00248.
  • 41 Hortobagyi GN, Stemmer SM, Burris HA. et al. Overall Survival with Ribociclib plus Letrozole in Advanced Breast Cancer. N Engl J Med 2022; 386: 942-950 DOI: 10.1056/NEJMoa2114663.
  • 42 Hortobagyi GN, Stemmer SM, Burris HA. et al. Ribociclib as First-Line Therapy for HR-Positive, Advanced Breast Cancer. N Engl J Med 2016; 375: 1738-1748 DOI: 10.1056/NEJMoa1609709.
  • 43 European Medicines Agency. Verzenios Summary of product characteristics (SmPC). 2022 Online (Stand: 26.03.2022): https://www.ema.europa.eu/en/documents/product-information/verzenios-epa-product-information_en.pdf
  • 44 Goetz MP, Toi M, Campone M. et al. MONARCH 3: Abemaciclib As Initial Therapy for Advanced Breast Cancer. J Clin Oncol 2017; 35: 3638-3646 DOI: 10.1200/JCO.2017.75.6155.
  • 45 Finn RS, Martin M, Rugo HS. et al. Palbociclib and Letrozole in Advanced Breast Cancer. N Engl J Med 2016; 375: 1925-1936 DOI: 10.1056/NEJMoa1607303.
  • 46 Finn RS, Rugo HS, Dieras VC. et al. Overall survival (OS) with first-line palbociclib plus letrozole (PAL+LET) versus placebo plus letrozole (PBO+LET) in women with estrogen receptor–positive/human epidermal growth factor receptor 2–negative advanced breast cancer (ER+/HER2− ABC): Analyses from PALOMA-2. J Clin Oncol 2022; 40: LBA1003 DOI: 10.1200/JCO.2022.40.17_suppl.LBA1003.
  • 47 Im SA, Lu YS, Bardia A. et al. Overall Survival with Ribociclib plus Endocrine Therapy in Breast Cancer. N Engl J Med 2019; 381: 307-316 DOI: 10.1056/NEJMoa1903765.
  • 48 Tripathy D, Im S-A, Colleoni M. et al. Abstract PD2-04: Updated overall survival (OS) results from the phase III MONALEESA-7 trial of pre- or perimenopausal patients with hormone receptor positive/human epidermal growth factor receptor 2 negative (HR+/HER2−) advanced breast cancer (ABC) treated with endocrine therapy (ET) ± ribociclib. Cancer Res 2021; 81: PD2-04 DOI: 10.1158/1538-7445.Sabcs20-pd2-04.
  • 49 Tripathy D, Im SA, Colleoni M. et al. Ribociclib plus endocrine therapy for premenopausal women with hormone-receptor-positive, advanced breast cancer (MONALEESA-7): a randomised phase 3 trial. Lancet Oncol 2018; 19: 904-915 DOI: 10.1016/S1470-2045(18)30292-4.
  • 50 Fasching PA, Esteva FJ, Pivot X. et al. Patient-reported outcomes (PROs) in advanced breast cancer (ABC) treated with ribociclib plus fulvestrant: Results from MONALEESA-3. Ann Oncol 2018; DOI: 10.1093/annonc/mdy272.282.
  • 51 Slamon DJ, Neven P, Chia S. et al. Overall Survival Results from the Phase 3 MONALEESA-3 Study of Fulvestrant ± Ribociclib in Postmenopausal Patients With HR+/HER2− Advanced Breast Cancer. Ann Oncol 2019; 30 (Suppl. 5) v851-v934 DOI: 10.1093/annonc/mdz394.
  • 52 Slamon DJ, Neven P, Chia S. et al. Overall Survival with Ribociclib plus Fulvestrant in Advanced Breast Cancer. N Engl J Med 2020; 382: 514-524 DOI: 10.1056/NEJMoa1911149.
  • 53 Slamon DJ, Neven P, Chia S. et al. Phase III Randomized Study of Ribociclib and Fulvestrant in Hormone Receptor-Positive, Human Epidermal Growth Factor Receptor 2-Negative Advanced Breast Cancer: MONALEESA-3. J Clin Oncol 2018; 36: 2465-2472 DOI: 10.1200/JCO.2018.78.9909.
  • 54 Sledge jr. GW, Toi M, Neven P. et al. The Effect of Abemaciclib Plus Fulvestrant on Overall Survival in Hormone Receptor-Positive, ERBB2-Negative Breast Cancer That Progressed on Endocrine Therapy-MONARCH 2: A Randomized Clinical Trial. JAMA Oncol 2020; 6: 116-124 DOI: 10.1001/jamaoncol.2019.4782.
  • 55 Sledge jr. GW, Toi M, Neven P. et al. MONARCH 2: Abemaciclib in Combination With Fulvestrant in Women With HR+/HER2- Advanced Breast Cancer Who Had Progressed While Receiving Endocrine Therapy. J Clin Oncol 2017; 35: 2875-2884 DOI: 10.1200/JCO.2017.73.7585.
  • 56 Cristofanilli M, Rugo HS, Im S-A. et al. Overall survival (OS) with palbociclib (PAL) + fulvestrant (FUL) in women with hormone receptor–positive (HR+), human epidermal growth factor receptor 2–negative (HER2–) advanced breast cancer (ABC): Updated analyses from PALOMA-3. J Clin Oncol 2021; 39: 1000 DOI: 10.1200/JCO.2021.39.15_suppl.1000.
  • 57 Turner NC, Slamon DJ, Ro J. et al. Overall Survival with Palbociclib and Fulvestrant in Advanced Breast Cancer. N Engl J Med 2018; 379: 1926-1936 DOI: 10.1056/NEJMoa1810527.
  • 58 Xu B, Zhang Q, Zhang P. et al. Dalpiciclib or placebo plus fulvestrant in hormone receptor-positive and HER2-negative advanced breast cancer: a randomized, phase 3 trial. Nat Med 2021; 27: 1904-1909 DOI: 10.1038/s41591-021-01562-9.
  • 59 Brett JO, Spring LM, Bardia A. et al. ESR1 mutation as an emerging clinical biomarker in metastatic hormone receptor-positive breast cancer. Breast Cancer Res 2021; 23: 85 DOI: 10.1186/s13058-021-01462-3.