Heather McArthur, MD, MPH

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Explore the latest advancements in clinical trials for early-stage triple-negative breast cancer, focusing on promising antibody-drug conjugates (ADCs).

Discover the promising advancements in TROP2-targeted antibody-drug conjugates for treating triple-negative and hormone-positive breast cancer.

Explore the evolving treatment landscape for early-stage triple-negative breast cancer, highlighting innovative therapies and clinical trial insights.

Explore the evolving treatment landscape for early-stage triple-negative breast cancer, highlighting innovative therapies and clinical trial insights.

Explore the latest advancements in antibody-drug conjugates for treating triple-negative breast cancer, addressing critical challenges and innovations.

Heather McArthur, MD, MPH, FASCO, discusses data from a phase 1/2 study evaluating palazestrant in ER+, HER2– advanced or metastatic breast cancer.

Heather McArthur, MD, discusses monitoring strategies for interstitial lung disease in patients with HER2-positive breast cancer treated with trastuzumab deruxtecan.

Heather McArthur, MD, MPH, FASCO, discusses the efficacy of pembrolizumab/chemo and sequencing the regimen in early triple-negative breast cancer.

Heather McArthur, MD, MPH, discusses the expanding clinical impact of ADCs in HER2-positive breast cancer.

Panelists discuss how emerging developments in HER2-positive (HER2+) breast cancer treatment, including novel antibody-drug conjugates, bispecific antibodies, and cytotoxic-sparing regimens for hormone receptor+ (HR+)/HER2+ disease, are creating exciting new options for patients.

Panelists discuss how they approach treatment beyond third-line therapy for HER2-positive (HER2+) metastatic breast cancer, considering factors such as prior therapies, residual toxicities, and patient preferences when selecting from multiple options.

Panelists discuss how they manage adverse effects of tucatinib-based therapy, particularly focusing on diarrhea and palmar-plantar erythrodysesthesia from capecitabine, with practical dosing strategies to improve tolerability.

Panelists discuss how the HER2CLIMB-02 and HER2CLIMB-05 trials might impact treatment sequencing, with particular interest in using tucatinib earlier in treatment to potentially prevent brain metastases.

Panelists discuss how National Comprehensive Cancer Network (NCCN) guidelines inform third-line treatment options for HER2-positive (HER2+) metastatic breast cancer, with particular focus on the HER2CLIMB regimen (tucatinib, capecitabine, and trastuzumab) for patients with brain metastases.

Panelists discuss how they would approach multiple brain metastases at initial metastatic diagnosis, debating the use of stereotactic radiosurgery vs systemic therapy with agents that cross the blood-brain barrier.

Panelists discuss how they approach the case of a 47-year-old marketing executive with initially low-risk HER2-positive (HER2+) breast cancer who developed brain, liver, lung, and bone metastases shortly after completing adjuvant therapy.

Panelists discuss how the presence of brain metastases influences treatment decisions in HER2-positive (HER2+) breast cancer, highlighting the DESTINY-Breast12 trial demonstrating trastuzumab deruxtecan’s (T-DXd) efficacy in patients with brain metastases.

Panelists discuss how they manage adverse effects of trastuzumab deruxtecan (T-DXd), particularly focusing on nausea, fatigue, and the critical monitoring needed for interstitial lung disease (ILD), with recommendations for prophylactic antiemetics and frequent imaging.

Panelists discuss how they approach treatment sequencing for HER2-positive (HER2+) metastatic breast cancer (mBC) after progression on first-line therapy, including considerations for trastuzumab deruxtecan and the impressive results from the PATINA trial adding CDK4/6 inhibitors to maintenance therapy.

Panelists discuss how a 52-year-old elementary school teacher diagnosed with HER2-positive (HER2+) breast cancer achieved pathologic complete response with neoadjuvant therapy but experienced metastasis 18 months after completing treatment, requiring first-line metastatic therapy.

In their concluding remarks, Virginia Kaklamani, MD, DSc, and Heather McArthur, MD, summarize their key insights and perspectives on the management of HR+ breast cancer.

The key opinion leaders discuss the current unmet needs in the management of HR+/HER2- metastatic breast cancer and explore potential future directions and strategies that may lead to improved patient outcomes.

In their discussion, the key opinion leaders explore the potential of combination therapies in HR+/HER2- metastatic breast cancer, with a specific focus on the ELECTRA study, which investigated the combination of elacestrant and abemaciclib.

The expert panel examines the subgroup data from the postMONARCH study, focusing on patients with ESR1 and PIK3CA mutations, and emphasizes the important role of CDK4/6 inhibitors in the treatment of these specific patient populations with HR+/HER2- metastatic breast cancer.

In their discussion, the key opinion leaders explore the significance of PIK3CA mutations in HR+/HER2- metastatic breast cancer and review the findings from two pivotal clinical trials, SOLAR-1 and CAPItello-291, which investigated the efficacy of targeted therapies in patients harboring these mutations.

Virginia Kaklamani, MD, DSc, and Heather McArthur, MD, discuss the clinical presentation and management of a 64-year-old postmenopausal female with a history of rheumatoid arthritis who was diagnosed with stage IV, grade 3, invasive ductal carcinoma in her left breast, taking into account her comorbidities and the advanced stage of her breast cancer.

The breast cancer experts share their clinical experiences and strategies regarding the optimal timing for testing ESR1 mutations in patients with HR+/HER2- metastatic breast cancer, elaborating on how the specific points in the treatment journey at which they recommend testing influence their subsequent treatment decisions and overall approach to patient management.

Key opinion leaders examine the EMERALD trial, which evaluates the efficacy of elacestrant in patients with HR+ HER2- metastatic breast cancer, focusing on the subgroup analysis of patients with visceral metastases, and explore how the trial's design and results have influenced their clinical practice.

Virginia Kaklamani, MD, DSc, and Heather McArthur, MD, present a patient case involving a 54-year-old postmenopausal woman diagnosed with a 2.1cm estrogen receptor positive (ER+), HER2 negative breast cancer, and discuss the clinical implications and management strategies for this specific patient scenario.