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What biomarkers do you use to help determine treatment for mTNBC?

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PD-L1
   
Germline BRCA1/2 mutation
   
HER2
   
All of the above
   
Other(s)
   

Tutorial

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How do you monitor for ILD in patients receiving trastuzumab deruxtecan?

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Chest CT scan
   
Chest X-ray
   
Respiratory function test
   
Patient reporting of symptoms
   
All/combination or above
   

Tutorial

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How confident are you in selecting an ADC treatment for patients eligible for >1?

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Not at all
   
A little
   
Moderately
   
Extremely
   
 
Breast cancer subtypes and biomarker testing
Making informed treatment decisions for patients with HR+/HER2– mBC
Practical advice for creating individualized treatment plans for patients with HER2+ mBC
Effectively integrating ADCs into the treatment pathway for patients with TNBC
Take CE/CME Test
Breast Cancer CE/CME accredited

touchIN CONVERSATION
A relaxed discussion between two faculty focussed on real world clinical issues. Useful tips below will show how to navigate the activity. Join the conversation. Close

Incorporating ADCs into the treatment of mBC: Practical considerations for the community oncologist

  • Select in the video player controls bar to choose subtitle language. Subtitles available in English, Arabic, French, German, Spanish.
  • A practice aid is available for this activity in the Toolkit
  • Downloads including slides are available for this activity in the Toolkit
Learning Objectives

After watching this activity, participants should be better able to:

  • Explain how biomarkers, patient characteristics and clinical data can be used to personalize care, including the incorporation of antibody–drug conjugate (ADC) treatment where appropriate, for patients with HR+/HER2– metastatic breast cancer (mBC)
  • Apply strategies to develop effective individualized treatment plans, including the use of ADCs where appropriate, for patients with HER2+ mBC
  • Describe how ADCs can be integrated into the treatment pathway for patients with triple-negative breast cancer
Overview

In this activity, two oncologists (a breast cancer expert from an academic setting and an oncologist from a community setting), respond to questions from the oncology community on how to integrate ADCs into the treatment pathway for patients with mBC. The experts will discuss the use of biomarkers to help guide treatment, share practical insights into developing individualized care plans, and provide strategies for managing ADC-associated toxicities.

This activity is jointly provided by USF Health and touchIME. touchIME is an EBAC® accredited provider. read more

Target Audience

This activity has been designed to meet the educational needs of oncologists, including community oncologists, involved in the management of patients with breast cancer.

USF Accreditation

Disclosures

USF Health adheres to the Standards for Integrity and Independence in Accredited Continuing Education. All individuals in a position to influence content have disclosed to USF Health any financial relationship with an ineligible organization. USF Health has reviewed and mitigated all relevant financial relationships related to the content of the activity. The relevant relationships are listed below. All individuals not listed have no relevant financial relationships.

Faculty

Dr Alison Conlin discloses: Advisory board/panel fees from Arvinas, AstraZeneca and Stemline Therapeutics. Consultancy fees from Pfizer.

Prof. Giuseppe Curigliano discloses: Advisory board/panel fees from AstraZeneca, Bristol Myers Squibb, Daiichi Sankyo, Exact Sciences, Gilead, Lilly, Menarini, Merck, Novartis, Pfizer and Roche (all relationships terminated). Consultancy fees from Ellipses Pharma (relationship terminated). Grants/research support from Merck (relationship terminated). Speakers’ bureau fees from AstraZeneca, Daiichi Sankyo, Exact Sciences, Gilead, Lilly, Menarini, Merck, Novartis, Pfizer and Roche (all relationships terminated).

Content reviewer

Danielle Walker, DNP, APRN, AGNP-C has no financial interests/relationships or affiliations in relation to this activity.

Touch Medical Contributors

Hannah Fisher has no financial interests/relationships or affiliations in relation to this activity.

USF Health Office of Continuing Professional Development and touchIME staff have no financial interests/relationships or affiliations in relation to this activity.

Requirements for Successful Completion

In order to receive credit for this activity, participants must review the content and complete the post-test and evaluation form. Statements of credit are awarded upon successful completion of the post-test and evaluation form.

If you have questions regarding credit please contact cpdsupport@usf.edu 

Accreditations

Physicians

This activity has been planned and implemented in accordance with the accreditation requirements and policies of the Accreditation Council for Continuing Medical Education (ACCME) through a joint providership of USF Health and touchIME. USF Health is accredited by the ACCME to provide continuing medical education for physicians.

USF Health designates this enduring material for a maximum of 0.75 AMA PRA Category 1 CreditTM.  Physicians should claim only the credit commensurate with the extent of their participation in the activity.

Advanced Practice Providers

Physician Assistants may claim a maximum of 0.75 Category 1 credits for completing this activity. NCCPA accepts AMA PRA Category 1 CreditTM from organizations accredited by ACCME or a recognized state medical society.

The AANPCP accepts certificates of participation for educational activities approved for AMA PRA Category 1 CreditTM by ACCME-accredited providers. APRNs who participate will receive a certificate of completion commensurate with the extent of their participation.

Date of original release: 26 June 2025. Date credits expire: 26 June 2026.

If you have any questions regarding credit, please contact cpdsupport@usf.edu

EBAC® Accreditation

touchIME is an EBAC® accredited provider since 2023.

This program is accredited by the European Board for Accreditation of Continuing Education for Health Professionals (EBAC®) for 46 minutes of effective education time.

EBAC® holds an agreement on mutual recognition of substantive equivalency with the US Accreditation Council for CME (ACCME) and the Royal College of Physicians and Surgeons of Canada, respectively.

Through an agreement between the European Board for Accreditation of Continuing Education for Health Professionals (EBAC®) and the American Medical Association, physicians may convert EBAC® External CME credits to AMA PRA Category 1 Credits™. Information on the process to convert EBAC® credit to AMA credit can be found on the AMA website. Other health care professionals may obtain from the AMA a certificate of having participated in an activity eligible for conversion of credit to AMA PRA Category 1 Credit™.

EBAC® is a member of the International Academy for CPD Accreditation (IACPDA) and a partner member of the International Association of Medical Regulatory Authorities (IAMRA).

Faculty Disclosure Statement / Conflict of Interest Policy

In compliance with EBAC® guidelines, all speakers/ chairpersons participating in this programme have disclosed or indicated potential conflicts of interest which might cause a bias in the presentations. The Organizing Committee/Course Director is responsible for ensuring that all potential conflicts of interest relevant to the event are declared to the audience prior to the CME activities.

Requirements for Successful Completion

Certificates of Completion may be awarded upon successful completion of the post-test and evaluation form. If you have completed one hour or more of effective education through EBAC® accredited CE activities, please contact us at accreditation@touchime.org to receive your EBAC® CE credit certificate. EBAC® grants 1 CE credit for every hour of education completed.

Date of original release: 26 June 2025. Date credits expire: 26 June 2027.

Time to Complete: 46 minutes

If you have any questions regarding the EBAC® credits, please contact accreditation@touchime.org

This activity is CE/CME accredited

To obtain the CE/CME credit(s) from this activity, please complete this post-activity test.

Claim Credit
  • Select in the video player controls bar to choose subtitle language. Subtitles available in English, Arabic, French, German, Spanish.
  • A practice aid is available for this activity in the Toolkit
  • Downloads including slides are available for this activity in the Toolkit

Topics covered in this activity

Breast Cancer
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touchIN CONVERSATION
Incorporating ADCs into the treatment of mBC: Practical considerations for the community oncologist
0.75 CE/CME credit

Question 1/5
Based on the College of American Pathologists’ expanded spectrum for HER2 positivity, what is the definition of HER2-low breast cancer, as assessed by IHC and ISH?

HER2, human epidermal growth factor receptor 2; IHC, immunohistochemistry; ISH, in situ hybridization.

The College of American Pathologists’ template for reporting breast cancer biomarker test results was recently updated to include detailed characteristics of HER2 IHC and ISH result categories, as well as optional report comments that include definitions of HER2-low and -ultralow breast cancer, based on data from the DESTINY-Breast04 and DESTINY-Breast06 clinical trials. HER2-low is defined as an IHC score of 1+ or 2+/ISH–, and HER2-ultralow is defined as an IHC score of 0 (pattern 0+) with membrane staining that is incomplete and faint/barely perceptible in ≤10% of tumour cells.

Abbreviations

HER2, human epidermal growth factor receptor 2; IHC, immunohistochemistry; ISH, in situ hybridization.

Reference

College of American Pathologists. Available at: https://capatholo.gy/4jQ5Ikx (accessed 16 May 2025).

Question 2/5
You are considering treatment for a patient with HR+/HER2– (IHC 0) metastatic breast cancer, with no targetable genomic alterations. They have received two lines of ET and one prior line of chemotherapy in the metastatic setting. The patient switched to a different chemotherapy regimen 4 months ago, but their disease has now progressed. Which of the following would you recommend for your patient?

ET, endocrine therapy; HER2, human epidermal growth factor receptor 2; HR, hormone receptor; IHC, immunohistochemistry.

ESMO guidelines recommend that, for patients with HR+/HER2– metastatic breast cancer who are not candidates for ET or targeted therapy and have already received ≥2 lines of chemotherapy for advanced disease, sacituzumab govitecan should be considered (evidence level: I, B); datopotamab deruxtecan may be considered for these patients after one line of chemotherapy in the advanced setting (I, B).1 NCCN guidelines recommend sacituzumab govitecan for patients with endocrine-refractory advanced disease who are not candidates for trastuzumab deruxtecan (category 1, preferred); datopotamab deruxtecan is recommended in this setting for HER2-low, -ultralow or -null disease (category 2A).2

Abbreviations

ESMO, European Society for Medical Oncology; ET, endocrine therapy; HER2, human epidermal growth factor receptor 2; HR, hormone receptor; NCCN, National Comprehensive Cancer Network®.

References

  1. Gennari A, et al. Ann Oncol. 2021;32:1475–95. ESMO Metastatic Breast Cancer Living Guidelines, v1.2 April 2025.
  2. NCCN Clinical Practice Guidelines in Oncology. Breast cancer. Version 4.2025 – April 17, 2025. Available at: www.NCCN.org (accessed 16 May 2025).
Question 3/5
What was the efficacy of trastuzumab deruxtecan in patients with HER2+ metastatic breast cancer with brain metastases, as reported in the DESTINY-Breast12 trial?

CNS, central nervous system; HER2, human epidermal growth factor receptor 2; ORR, objective response rate; OS, overall survival.

DESTINY-Breast12 was a prospective, non-comparative phase IIIb/IV trial that evaluated the activity of trastuzumab deruxtecan in patients with HER2+ metastatic breast cancer, including those with baseline BM (overall, n=263; stable, n=157; active, n=106) and without baseline BM (n=241). The confirmed CNS ORR was 72% in the overall BM cohort, 79% in those with stable BM and 62% in those with active BM. The 12-month OS rate in patients with baseline BM (90%) was similar to those without baseline BM (91%).

Abbreviations

BM, brain metastasis; CNS, central nervous system; HER2, human epidermal growth factor receptor 2; ORR, objective response rate; OS, overall survival.

Reference

Harbeck N, et al. Nat Med. 2024;30:3717–27.

Question 4/5
Your patient is receiving fourth-line trastuzumab emtansine for HER2+ breast cancer with active brain metastases, having already received trastuzumab deruxtecan, and local intervention with SRS is indicated. How do you approach this to balance efficacy and safety?

HER2, human epidermal growth factor receptor 2; SRS, stereotactic radiosurgery; WBRT, whole-brain radiotherapy.

Combining trastuzumab emtansine with SRS raises safety concerns due to a lack of robust evidence.1 A recent meta-analysis reported a 17% pooled incidence of grade ≥3 radionecrosis when trastuzumab emtansine was combined with brain SRS, higher than the 6–11% incidence after brain SRS alone.1 Retrospective studies have also demonstrated an increased risk of radionecrosis when SRS is delivered concurrently with ADCs.2–4 While robust data and consensus recommendations are lacking regarding the safety of combining ADC treatment and SRS for brain metastases in breast cancer, these results highlight a potential increased risk associated with combination therapy.1–3 Therefore, concurrent SRS and trastuzumab emtansine should be avoided in the absence of solid evidence.4

Abbreviations

ADC, antibody–drug conjugate; SRS, stereotactic radiosurgery.

References

  1. Salvestrini V, et al. Radiother Oncol. 2023:186:109805.
  2. Koide Y, et al. J Neurooncol. 2024;168:415–23.
  3. Lebow ES, et al. JAMA Oncol. 2023;9:1729–33.
  4. Debbi K, et al. Cancers (Basel). 2023;15:2278.
Question 5/5
Your patient with TNBC (PD-L1-negative, germline BRCA1/2 wildtype, HER2-null) shows evidence of disease progression during first-line chemotherapy for metastatic disease. Based on current ESMO and NCCN guidelines, what is your next step?

ESMO, European Society for Medical Oncology; HER2, human epidermal growth factor receptor 2; NCCN, National Comprehensive Cancer Network®; PD-L1, programmed death-ligand 1; TNBC, triple-negative breast cancer.

For patients with PD-L1-negative, germline BRCA1/2 wildtype metastatic TNBC with disease progression on first-line chemotherapy, ESMO guidelines recommend second-line sacituzumab govitecan (I, A; preferred) or chemotherapy (I, B).1 NCCN guidelines also recommend sacituzumab govitecan for this patient population (category 1, preferred).2 Trastuzumab deruxtecan is recommended in the second-line setting for HER2-low disease (ESMO II, B; NCCN category 2A),1,2 which is not applicable here as this patient has HER2-null disease.

Abbreviations

ESMO, European Society for Medical Oncology; HER2, human epidermal growth factor receptor 2; NCCN, National Comprehensive Cancer Network®; PD-L1, programmed death-ligand 1; TNBC, triple-negative breast cancer.

References

  1. Gennari A, et al. Ann Oncol. 2021;32:1475–95. ESMO Metastatic Breast Cancer Living Guidelines, v1.2 April 2025.
  2. NCCN Clinical Practice Guidelines in Oncology. Breast cancer. Version 4.2025 – April 17, 2025. Available at: www.NCCN.org (accessed 16 May 2025).
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