• Plenary session to highlight use of Guardant360 CDx test in detecting emerging ESR1 mutations during first line endocrine therapy in advanced breast cancer in Phase 3 SERENA-6 trial
• Oral session to feature largest study evaluating tissue-free epigenomic-based molecular residual disease (MRD) detection in colon cancer using Guardant Reveal

Guardant Health, Inc. (NASDAQ:GH), a leading precision oncology company, today announced the company and its research collaborators will present data from more than 19 studies, including a landmark plenary session on the Phase 3 SERENA-6 trial, demonstrating the critical role of Guardant liquid biopsy tests in cancer screening, therapy selection and recurrence monitoring at the 2025 American Society for Clinical Oncology (ASCO) Annual Meeting in Chicago.

Featured presentations demonstrate the use of Guardant's portfolio of blood tests, real-world data and AI to identify genomic and epigenomic biomarkers that can inform treatment decisions across a variety of solid tumor types. Studies also highlight new capabilities of the Guardant360 Liquid test to identify molecular tumor type in carcinomas of unknown primary and confirm the absence of actionable biomarkers, both enabled by the Guardant Infinity™ smart liquid biopsy platform, Presentation highlights include:

• Abstract LBA4 plenary session demonstrating the use of the Guardant360® CDx test in detecting emergent ESR1 mutations during first-line endocrine-based therapy and ahead of disease progression in patients with HR+/HER2- advanced breast cancer in the Phase 3 SERENA-6 trial
• Abstract 3504 oral session evaluating tissue-free epigenomic-based molecular residual disease (MRD) detection using Guardant Reveal™ in stage III colon cancer patients after surgery and prior to adjuvant therapy. This study showed a robust prognostic utility of Reveal to identify patients with poorer disease-free and overall survival in a large clinical trial cohort of over 2,000 patients with a median follow-up of 6.1 years.
• Abstract 3584 providing analytic and clinical validation of an algorithm to predict the absence of actionable mutations in ctDNA-negative colorectal and non-small cell lung cancer samples, utilizing genomic and epigenomic profiling with the Guardant360 Liquid test.
• Abstract 3073 demonstrating application of an epigenomic-based classifier to identify tumor type on liquid biopsy in cancer of unknown primary origin. Study provides validation data for the new molecular tumor type feature of Guardant360 Liquid utilizing DNA methylation signatures across thousands of cancer-specific differentially methylated regions for 14 cancer types.