Examining the role of tissue-agnostic ctDNA monitoring in breast cancer [Video]

Mitchell Elliott, MD, UHN Princess Margaret Cancer Centre, Toronto, Canada, delves into a prospective cohort study evaluating CDK4/6 inhibitors in patients with HR+/HER2- metastatic breast cancer. Baseline methylation-based tumor fraction (TF) and circulating tumor DNA (ctDNA) clearance were predictive of CDK4/6i-progression-free survival (PFS). Longitudinal sampling revealed rising methylation TF preceding clinical progression, highlighting its potential for early resistance detection. This interview took place at American Association for Cancer Research (AACR) Annual Meeting 2024 in San Diego, CA.

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