SABCS Highlights

Patients with hormone receptor (HR)-positive, HER2-negative advanced breast cancer, including those with visceral crises, treated with the CDK4/6 inhibitor ribociclib (Kisqali) plus endocrine therapy had a significantly longer progression-free survival (PFS) and fewer adverse events (AEs) compared with those treated with combination chemotherapy, according to results from the phase 2 RIGHT Choice trial.
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Using circulating tumor cell (CTC) count to guide the choice of first-line treatment—chemotherapy or endocrine therapy—improved overall survival (OS) compared with investigator’s choice of treatment for patients with metastatic, estrogen receptor (ER)-positive, HER2-negative breast cancer, according to results from the STIC CTC trial, which were discussed at the 2022 San Antonio Breast Cancer Symposium (SABCS) by François-Clément Bidard, MD, PhD, Co-Coordinator, Breast Cancer Research, Institut Curie, Paris, France, and Professor, Medicine, Department of Medical Oncology, Institut Curie and Université de Versailles Saint-Quentin-en-Yvelines, France.
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Second-line therapy with trastuzumab deruxtecan (Enhertu; T-DXd) extended progression-free survival (PFS) and improved objective response rate (ORR) versus trastuzumab emtansine (Kadcyla; T-DM1) in women with HER2-positive metastatic breast cancer, including those with stable brain metastasis at baseline, according to a subgroup analysis of a phase 3 clinical trial.
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Final results from the pivotal phase 3 KEYNOTE-355 trial showed that the addition of pembrolizumab (Keytruda) to chemotherapy resulted in a statistically significant and clinically meaningful improvement in overall survival (OS) compared with chemotherapy alone in patients with metastatic triple-negative breast cancer (TNBC) whose tumors expressed PD-L1 with a combined positive score (CPS) ≥10.
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CDK4/6 Inhibitors in HER2+ Metastatic Breast Cancer
Dr Matthew Goetz addresses the prospect of utilizing CDK4/6 inhibitors to treat patients with HER2+ metastatic breast cancer, stating early data indicate that CDK4/6 inhibitors may have some antitumor activity in HER2+ breast cancer.
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Questions About Treating Patients Using a CDK4/6 Inhibitor
Dr Matthew Goetz addresses common questions that arise when patients with HER-positive metastatic breast cancer have progressed on a CDK4/6 inhibitor plus an aromatase inhibitor.
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Abemaciclib, Ribociclib, or Palbociclib for HR+ Metastatic Breast Cancer?
Dr Matthew Goetz reviews what differentiates abemaciclib, the latest CDK4/6 inhibitor FDA approved for HR+ metastatic breast cancer, from ribociclib and palbociclib.
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The Use of Chemotherapy in the Metastatic Setting
Dr Matthew Goetz believes that, as more mature data come into existence, the demonstration of a survival advantage will guide more patients with metastatic breast cancer to try CDK4/6 inhibitors plus aromatase inhibitors instead of chemotherapy.
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The Mechanism of Action of CDK4/6 Inhibitors
Dr Matthew Goetz explains the rationale for using CDK4/6 inhibitors in patients with HR-positive metastatic breast cancer.
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HER2-Positive Breast Cancer and CDK4/6 Inhibitors
Dr Hope Rugo discusses studies that are aiming to evaluate the effect that CDK4/6 inhibitors have on patients with HER2-positive breast cancer.
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