Optimizing the Use of Oral Selective Estrogen Receptor Degraders for HR-Positive Metastatic Breast Cancer, Part 2 — Webinar Video Proceedings

Faculty

TARGET AUDIENCE
This program is intended for medical oncologists, breast surgeons, radiation oncologists and other healthcare professionals involved in the diagnosis and treatment of breast cancer.

LEARNING OBJECTIVES

• Appreciate the incidence and clinical implications of ESR1 mutations in endocrine-resistant metastatic breast cancer (mBC), and determine optimal strategies to effectively identify patients harboring these abnormalities.
• Understand the biological rationale for, mechanism of action of and pharmacologic similarities and differences among available and investigational oral selective estrogen receptor degraders (SERDs).
• Interrogate published research findings documenting the efficacy of available and investigational oral SERDs for patients with ER-positive, HER2-negative, ESR1-mutant mBC experiencing disease progression on standard endocrine therapy in combination with a CDK4/6 inhibitor in order to optimally integrate these agents into the care of appropriately selected individuals.
• Evaluate available clinical trial data with oral SERDs in combination with other therapeutic agents for patients with ER-positive, HER2-negative mBC with and without ESR1 mutations, and consider the potential role of these regimens.
• Appreciate side effects associated with available and investigational oral SERDs, and use this information to develop supportive management plans for patients undergoing treatment with this form of therapy.
• Assess ongoing clinical research studies evaluating novel applications of oral SERDs for ER-positive breast cancer, and counsel patients regarding the potential benefits of trial participation.

ACCREDITATION STATEMENT
Research To Practice is accredited by the Accreditation Council for Continuing Medical Education (ACCME) to provide continuing medical education for physicians.

CREDIT DESIGNATION STATEMENT
Video Program: Research To Practice designates this enduring material for a maximum of 1.25 AMA PRA Category 1 Credits™. Physicians should claim only the credit commensurate with the extent of their participation in the activity.

AMERICAN BOARD OF INTERNAL MEDICINE (ABIM) — MAINTENANCE OF CERTIFICATION (MOC)
Successful completion of these CME activities, which includes participation in the evaluation components and post-tests, enables the participant to earn up to 1.25 (video) Medical Knowledge MOC points in the American Board of Internal Medicine’s (ABIM) Maintenance of Certification (MOC) program. Participants will earn MOC points equivalent to the amount of CME credits claimed for each activity. It is the CME activity provider’s responsibility to submit participant completion information to ACCME for the purpose of granting ABIM MOC credit.

Please note, these programs have been specifically designed for the following ABIM specialty: medical oncology.

AMERICAN BOARD OF SURGERY (ABS) — CONTINUOUS CERTIFICATION (CC)
Successful completion of these CME activities, which includes participation in the evaluation components and post-tests, enables the learner to earn credit toward the CME and Self-Assessment requirement(s) of the American Board of Surgery’s Continuous Certification program. It is the CME activity provider’s responsibility to submit participant completion information to ACCME for the purpose of granting ABS credit.

Please note, these programs have been specifically designed for the following ABS practice area: complex general surgical oncology.

PRIVACY POLICY
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HOW TO USE THIS CME ACTIVITY
Video Program: This CME activity consists of a video component. To receive credit, the participant should review the CME information, watch the video, complete the post-test with a score of 80% or better and fill out the evaluation located at ResearchToPractice.com/OralSERDSmBC2025/2/Video/CME.

CONTENT VALIDATION AND DISCLOSURES
Research To Practice (RTP) is committed to providing its participants with high-quality, unbiased and state-of-the-art education and adheres to the ACCME’s Standards for Integrity and Independence in Accredited Continuing Education. Any individuals in a position to control the content of an accredited continuing education activity, including faculty, planners, reviewers and others, are required to disclose all relevant financial relationships with ineligible entities (commercial interests). All relevant financial relationships have been mitigated prior to the commencement of this activity. In addition, all activity content is reviewed by RTP scientific staff and an external, independent physician reviewer for fair balance, scientific objectivity of studies referenced and patient care recommendations.

FACULTY — The following faculty reported relevant financial relationships with ineligible entities:

Rinath M Jeselsohn, MD
Physician
Associate Professor of Medicine
Harvard Medical School
Director for ER+ Translational Discovery Research
Director of Lobular Breast Cancer
Dana-Farber Cancer Institute
Boston, Massachusetts

Advisory Committees: AstraZeneca Pharmaceuticals LP, Lilly, Pfizer Inc; Contracted Research: Novartis.

Joyce O’Shaughnessy, MD
Celebrating Women Chair in Breast Cancer Research
Baylor University Medical Center
Chair, Breast Disease Committee
Sarah Cannon Research Institute
Dallas, Texas

Advisory Committees and Consulting Agreements: Aadi Bioscience, Agendia Inc, Amgen Inc, Aptitude Health, AstraZeneca Pharmaceuticals LP, BioNTech SE, Bristol Myers Squibb, Daiichi Sankyo Inc, Duality Biologics, Eisai Inc, Ellipses Pharma, Exact Sciences Corporation, G1 Therapeutics Inc, Genentech, a member of the Roche Group, Gilead Sciences Inc, Guardant Health, HiberCell, Jazz Pharmaceuticals Inc, Johnson & Johnson, Lilly, Merck, Mersana Therapeutics Inc, Natera Inc, Novartis, Pfizer Inc, Pierre Fabre, Puma Biotechnology Inc, RayzeBio Inc, Roche Laboratories Inc, Sanofi, Seagen Inc, Stemline Therapeutics Inc, Summit Therapeutics, Tempus, TerSera Therapeutics LLC.

MODERATOR — Dr Love is president and CEO of Research To Practice. Research To Practice receives funds in the form of educational grants to develop CME activities from the following companies: Aadi Bioscience, AbbVie Inc, ADC Therapeutics, Agendia Inc, Alexion Pharmaceuticals, Amgen Inc, Array BioPharma Inc, a subsidiary of Pfizer Inc, Arvinas, Astellas, AstraZeneca Pharmaceuticals LP, Aveo Pharmaceuticals, Bayer HealthCare Pharmaceuticals, BeOne, Black Diamond Therapeutics Inc, Blueprint Medicines, Boehringer Ingelheim Pharmaceuticals Inc, Bristol Myers Squibb, Celcuity, Clovis Oncology, Coherus BioSciences, Corcept Therapeutics Inc, CTI BioPharma, a Sobi Company, Daiichi Sankyo Inc, Eisai Inc, Elevation Oncology Inc, Exact Sciences Corporation, Exelixis Inc, Genentech, a member of the Roche Group, Genmab US Inc, Geron Corporation, Gilead Sciences Inc, GSK, Helsinn Therapeutics (US) Inc, Hologic Inc, ImmunoGen Inc, Incyte Corporation, Ipsen Biopharmaceuticals Inc, Jazz Pharmaceuticals Inc, Johnson & Johnson, Karyopharm Therapeutics, Kite, A Gilead Company, Kura Oncology, Legend Biotech, Lilly, MEI Pharma Inc, Merck, Mersana Therapeutics Inc, Mirati Therapeutics Inc, Mural Oncology Inc, Natera Inc, Novartis, Novartis Pharmaceuticals Corporation on behalf of Advanced Accelerator Applications, Novocure Inc, Nuvalent, Pfizer Inc, Pharmacyclics LLC, an AbbVie Company, Puma Biotechnology Inc, Regeneron Pharmaceuticals Inc, Rigel Pharmaceuticals Inc, R-Pharm US, Sanofi, Seagen Inc, Servier Pharmaceuticals LLC, SpringWorks Therapeutics Inc, Stemline Therapeutics Inc, Sumitomo Pharma America, Syndax Pharmaceuticals, Taiho Oncology Inc, Takeda Pharmaceuticals USA Inc, TerSera Therapeutics LLC, and Tesaro, A GSK Company.

RESEARCH TO PRACTICE CME PLANNING COMMITTEE MEMBERS, STAFF AND REVIEWERS — Planners, scientific staff and independent reviewers for Research To Practice have no relevant financial relationships to disclose.

These educational activities contain discussion of published and/or investigational uses of agents that are not indicated by the Food and Drug Administration. Research To Practice does not recommend the use of any agent outside of the labeled indications. Please refer to the official prescribing information for each product for discussion of approved indications, contraindications and warnings. The opinions expressed are those of the presenters and are not to be construed as those of the publisher or grantor.

These activities are supported by an educational grant from Lilly.

Release date: November 2025
Expiration date: November 2026

After completing the post-test, learners may download and review the answers here in order to identify further areas of study.

Bardia A et al. Elacestrant in ER+, HER2− metastatic breast cancer with ESR1-mutated tumors: Subgroup analyses from the phase III EMERALD trial by prior duration of endocrine therapy plus CDK4/6 Inhibitor and in clinical subgroups. Clin Cancer Res 2024;30(19):4299-309. Abstract

Bardia A et al. Elacestrant, an oral selective estrogen receptor degrader (SERD), vs investigator’s choice of endocrine monotherapy for ER+/HER2- advanced/metastatic breast cancer (mBC) following progression on prior endocrine and CDK4/6 inhibitor therapy: Results of EMERALD phase 3 trial. San Antonio Breast Cancer Symposium 2021;Abstract GS2-02.

Bidard FC et al. First-line camizestrant for emerging ESR1-mutated advanced breast cancer. N Engl J Med 2025;393(6):569-80. Abstract

Bidard FC et al. Dynamics and type of ESR1 mutations under aromatase inhibitor or fulvestrant combined with palbociclib after randomization in the PADA-1 trial. ASCO 2023;Abstract 1002.

Bidard FC 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(28):3246-56. Abstract

Cristofanilli M et al. 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(16):3433-42. Abstract

Fizazi K et al. A phase III study of capivasertib (capi) + abiraterone (abi) vs placebo (pbo) + abi in patients (pts) with PTEN deficient de novo metastatic hormone-sensitive prostate cancer (mHSPC): CAPItello-281. ESMO 2025;Abstract 2383O.

Gheysen M et al. Oral SERDs changing the scenery in hormone receptor positive breast cancer, a comprehensive review. Cancer Treat Rev 2024;130:102825. Abstract

Grinshpun A et al. The clinical utility of ESR1 mutations in hormone receptor-positive, HER2-negative advanced breast cancer. Hematol Oncol Clin North Am 2023;37(1):169-81. Abstract

Hattori M et al. Genomic landscape of circulating tumor DNA in patients with hormone receptor-positive/human epidermal growth factor receptor-2-negative metastatic breast cancer treated with abemaciclib: Data from the SCRUM-Japan cancer genome screening project. JCO Precis Oncol 2024;8:e2300647. Abstract

Jeselsohn R et al. Circulating tumor DNA mutational landscape and dynamics after progression on a CDK4/6 inhibitor in the PACE phase II trial for metastatic HR-positive/HER2-negative breast cancer. ESMO Open 2025 Aug;10(8):105506. Abstract

Jeselsohn R et al. ESR1 mutations — A mechanism for acquired endocrine resistance in breast cancer. Nat Rev Clin Oncol 2015;12(10):573-83. Abstract

Jhaveri K et al. Imlunestrant with or without abemaciclib in advanced breast cancer. N Engl J Med 2025;392(12):1189-202. Abstract

Jhaveri KL et al. Overall survival with inavolisib in PIK3CA-mutated advanced breast cancer. N Engl J Med 2025;393(2):151-61. Abstract

Jhaveri KL et al. Imlunestrant, an oral selective estrogen receptor degrader (SERD), as monotherapy & combined with abemaciclib, for patients with ER+, HER2- advanced breast cancer (ABC), pretreated with endocrine therapy (ET): Results of the phase 3 EMBER-3 trial. San Antonio Breast Cancer Symposium 2024;Abstract GS1-01.

Kingston B et al. Genomic profile of advanced breast cancer in circulating tumour DNA. Nat Commun 2021;12(1):2423. Abstract

Mayer E et al. Giredestrant (GIRE), an oral selective oestrogen receptor (ER) antagonist and degrader, + everolimus (E) in patients (pts) with ER-positive, HER2-negative advanced breast cancer (ER+, HER2– aBC) previously treated with a CDK4/6 inhibitor (i): Primary results of the phase III evERA BC trial. ESMO 2025;Abstract LBA16.

Oliveira M et al. Camizestrant, a next-generation oral SERD, versus fulvestrant in post-menopausal women with oestrogen receptor-positive, HER2-negative advanced breast cancer (SERENA-2): A multi-dose, open-label, randomised, phase 2 trial. Lancet Oncol 2024;25(11):1424-39. Abstract

Oliveira M et al. Clinical activity of camizestrant, a next-generation SERD, versus fulvestrant in patients with a detectable ESR1 mutation: Exploratory analysis of the SERENA-2 phase 2 trial. ASCO 2023;Abstract 1066.

Turner NC et al. Camizestrant + CDK4/6 inhibitor (CDK4/6i) for the treatment of emergent ESR1 mutations during first-line (1L) endocrine-based therapy (ET) and ahead of disease progression in patients (pts) with HR+/HER2– advanced breast cancer (ABC): Phase 3, double-blind ctDNA-guided SERENA-6 trial. ASCO 2025;Abstract LBA4.

Turner NC et al. Capivasertib in hormone receptor-positive advanced breast cancer. N Engl J Med 2023;388(22):2058-70. Abstract