The Pharmacy Times® Breast Cancer Resource Center is a comprehensive resource for clinical news and expert insights on issues related to cancers that occur in the breast, including invasive ductal carcinoma, invasive lobular carcinoma, and less common forms of the disease.
August 22nd 2025
The ASTER 70s trial found that adjuvant chemotherapy provided no significant survival benefit, but caused substantial toxicity in older women with high-risk HR-positive, HER2-negative breast cancer.
Key Considerations for Oncology Pharmacists When Selecting and Sequencing ADC Therapies
Panelists discuss how when making antibody-drug conjugate (ADC) treatment decisions for patients with metastatic breast cancer (mBC), pharmacists primarily consider patient-specific factors such as biomarker status, prior therapies, disease burden, and comorbidities. ADCs are typically introduced after standard first-line treatments show inadequacy or in specific molecular subtypes that demonstrate strong responses to targeted therapy.
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Comparing Approved ADC Options in HER2-Negative and HER2-Low Breast Cancer
Panelists discuss how antibody-drug conjugates (ADCs) for breast cancer (BC) differ in their safety profiles, with trastuzumab deruxtecan (T-DXd) having notable interstitial lung disease risk, sacituzumab govitecan (SG) associated with neutropenia/diarrhea, and datopotamab deruxtecan (Dato-DXd) showing a relatively favorable safety profile but still requiring monitoring.
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Beyond HER2: Expanding the Biomarker Testing Landscape in Metastatic Breast Cancer
Panelists discuss how HER2 testing optimization requires multisite sampling and quantitative assessment methods to account for intratumoral heterogeneity. Beyond HER2, biomarkers such as PI3K mutations, hormone receptor status, and tumor mutational burden can guide therapy selection for metastatic breast cancer (mBC), enabling more personalized treatment approaches.
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How ADC Design Influences Efficacy and Safety
Panelists discuss how antibody-drug conjugates (ADCs) show varying efficacy and adverse event (AE) profiles based on their payload potency, linker stability, and drug-to-antibody ratio. Cleavable linkers enable targeted drug release but may increase toxicity, while noncleavable designs offer better stability. Payload selection impacts both therapeutic index and AEs, with more potent warheads requiring careful optimization of targeting and release kinetics.
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