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Opinion|Videos|January 14, 2025

Current Practices for Targeted Therapies and Molecular Testing for HR+/HER2- Metastatic Breast Cancer

Panelists discuss how the latest NCCN guidelines for targeted therapies and biomarker testing in advanced/metastatic breast cancer highlight the importance of biomarker-driven approaches, with particular emphasis on the need for next-generation sequencing testing in the first-line setting, the implications of HER2-low classification, and how the recent FDA approval of a PI3K inhibitor may impact testing practices and treatment strategies.

Episodes in this series

EP. 1 Diagnosis and Risk Stratification for Early-Stage HR+/HER2- Breast Cancer

EP. 1 Diagnosis and Risk Stratification for Early-Stage HR+/HER2- Breast Cancer

EP. 2 CDK4/6 Inhibitors for HR+/HER2- Early Breast Cancer

EP. 2 CDK4/6 Inhibitors for HR+/HER2- Early Breast Cancer

EP. 3 Current Practices for Targeted Therapies and Molecular Testing for HR+/HER2- Metastatic Breast Cancer

EP. 3 Current Practices for Targeted Therapies and Molecular Testing for HR+/HER2- Metastatic Breast Cancer

EP. 4 Exploring 1L and 2L CDK4/6 Inhibitors + Endocrine Therapies

EP. 4 Exploring 1L and 2L CDK4/6 Inhibitors + Endocrine Therapies

EP. 5 Clinical Perspectives: Use of CDK4/6i After CDK4/6i

EP. 5 Clinical Perspectives: Use of CDK4/6i After CDK4/6i

EP. 6 The Current Treatment Landscape of Oral SERDs in Metastatic Breast Cancer

EP. 6 The Current Treatment Landscape of Oral SERDs in Metastatic Breast Cancer

EP. 7 Clinical Findings of Elacestrant, an Oral SERD for ER+/HER2– Metastatic Breast Cancer

EP. 7 Clinical Findings of Elacestrant, an Oral SERD for ER+/HER2– Metastatic Breast Cancer

EP. 8 Emerging Data of Additional SERDs in Metastatic Breast Cancer

EP. 8 Emerging Data of Additional SERDs in Metastatic Breast Cancer

EP. 9 CDK4/6 Inhibitors Plus Novel Agents for ER+/HER2–Advanced or mBC

EP. 9 CDK4/6 Inhibitors Plus Novel Agents for ER+/HER2–Advanced or mBC

EP. 10 Toxicities and Treatment Selection of Endocrine-Based Therapies in HR+/HER2– Breast Cancer

EP. 10 Toxicities and Treatment Selection of Endocrine-Based Therapies in HR+/HER2– Breast Cancer

EP. 11 Genotype-Directed Therapies for HR+/HER2– Advanced Breast Cancer

EP. 11 Genotype-Directed Therapies for HR+/HER2– Advanced Breast Cancer

EP. 12 Exploring Data of PI3K/AKT/mTOR Inhibitors in HER2– mBC

EP. 12 Exploring Data of PI3K/AKT/mTOR Inhibitors in HER2– mBC

EP. 13 Clinical Developments of Antibody-Drug Conjugates (ADCs) in HR+/HER2– mBC

EP. 13 Clinical Developments of Antibody-Drug Conjugates (ADCs) in HR+/HER2– mBC

EP. 14 ADCs: Recent Data of Dato-DXd from TROPION-Breast01

EP. 14 ADCs: Recent Data of Dato-DXd from TROPION-Breast01

EP. 15 Impact of ADC Toxicities and Clinical Decision-Making for mBC

EP. 15 Impact of ADC Toxicities and Clinical Decision-Making for mBC

EP. 16 Continued Advances and Treatment Sequencing for HR+/HER2– Breast Cancer

EP. 16 Continued Advances and Treatment Sequencing for HR+/HER2– Breast Cancer

Video content above is prompted by the following:

Please briefly mention the latest NCCN guidelines for targeted therapies and associated biomarker testing.
How does biomarker testing differ in advanced/metastatic breast cancer from early-stage disease?
What should be considered when testing in the first line for advanced disease?
Is there a need for next-generation sequencing testing before first-line metastatic disease? (eg, BRCA, PIK3CA, PD-L1, NTRK, microsatellite instability–high/mismatch repair deficiency, high tumor mutational burden)
Will the recent FDA approval of a PI3K inhibitor affect your testing practice?
For a patient whose cancer has progressed, do you obtain a new biopsy or go back to the original sample? Why?
How has immunohistochemistry (IHC) testing changed with the addition of HER2-low to NCCN guidelines?
How are you interpreting IHC staining results for HER2-low?
How are results reported? Are you given a percentage of staining, or are you given the category of HER2-low?

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