Guardant Health and Collaborators to Present 38 Abstracts Highlighting Breadth and Expanded Clinical Utility of Guardant Liquid Biopsy Tests Powered by InfinityAI at 2026 ASCO Annual Meeting

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PALO ALTO, Calif., May 28, 2026 --( BUSINESS WIRE )--Guardant Health, Inc. (Nasdaq: GH), a leading precision oncology company, today announced the company and its research collaborators will present 38 abstracts, as well as one oral presentation in partnership with Pfizer, showcasing advances in methylation-based tumor classification and liquid biopsy technology at the American Society of Clinical Oncology (ASCO) Annual Meeting in Chicago, Illinois taking place May 29 – June 2, 2026. Key data that will be presented include: "Our presence at this year’s ASCO reflects the power of liquid biopsy tests to provide oncologists with actionable insights to more effectively treat patients in a faster amount of time," said Helmy Eltoukhy, Guardant Health chairman and co-CEO. "Guardant’s Smart Platform, an AI-enabled multiomic technology platform behind our next generation of cancer tests, is fueling the entire portfolio and supporting new clinical applications across the cancer care continuum." Key Guardant Health and collaborator presentations at ASCO 2026 The full abstracts for Guardant Health and a list of all abstracts being presented at ASCO 2026 can be found on the ASCO website . About Guardant360® Liquid CDx The largest FDA-approved liquid biopsy, Guardant360 Liquid CDx is the only FDA-approved liquid biopsy test integrating genomic and epigenomic data for comprehensive insights. Guardant360 Liquid CDx is approved as a companion diagnostic for multiple therapies in non-small cell lung cancer and colorectal cancer. It is also the only FDA-approved companion diagnostic for targeted therapy in advanced breast cancer patients with ESR1 mutations. The test is broadly covered by Medicare and commercial insurers, representing over 300 million lives. About Guardant360 Liquid Guardant360 Liquid is a blood-based test that analyzes tumor DNA fragments circulating in the blood (cfDNA) to identify genetic mutations in advanced solid tumors, helping oncologists find targeted therapies. It offers an alternative to tissue biopsies, providing comprehensive genomic profiling (CGP) to guide personalized treatment for a wide range of solid cancers including lung, breast, colorectal, and prostate cancer. Guardant360 Liquid is guideline-complete across all advanced solid tumors, and has been clinically validated in more than 1,500 publications and research abstracts. About Guardant Reveal Guardant Reveal is a tissue-free liquid biopsy test that detects minimal residual disease (MRD) and monitors recurrence in early-stage colorectal, breast, and lung cancers, helping oncologists guide treatment decisions. In addition to MRD detection, Reveal can be used for late-stage therapy response monitoring for patients with solid tumors. Guardant Reveal therapy response monitoring can be initiated at any time during a patient’s treatment journey, offering clinicians flexibility and actionable insights. The first clinical-validation study of pan-cancer chemotherapy monitoring published in The Journal of Liquid Biopsy showed that Guardant Reveal predicts long-term patient benefit up to 18 months earlier than standard clinical measures. About Shield Shield is a methylation partitioning cell-free DNA (mp-cfDNA) non-invasive, blood-based screening test that detects alterations associated with colorectal cancer in the blood. It is intended as a screening test for individuals at average risk for the disease, age 45 or older, and is not intended for individuals at high risk for colorectal cancer. The Shield test can be considered in a manner similar to guideline-recommended non-invasive CRC screening options and can be completed during any healthcare visit. A positive Shield result raises concern for the presence of colorectal cancer or advanced adenoma and the patient should be referred for colonoscopy evaluation. About Guardant Health Guardant Health is a leading precision oncology company focused on guarding wellness and giving every person more time free from cancer. Founded in 2012, Guardant is transforming patient care and accelerating new cancer therapies by providing critical insights into what drives disease through its advanced blood and tissue tests, real-world data and AI analytics. Guardant tests help improve outcomes across all stages of care, including screening to find cancer early, monitoring for recurrence in early-stage cancer, and treatment selection for patients with advanced cancer. For more information, visit guardanthealth.com and follow the company on LinkedIn , X (Twitter) and Facebook . Guardant Health Forward-Looking Statements This press release contains forward-looking statements within the meaning of federal securities laws, including statements regarding the potential utilities, values, benefits and advantages of Guardant Health’s liquid biopsy tests or assays, which involve risks and uncertainties that could cause the actual results to differ materially from the anticipated results and expectations expressed in these forward-looking statements. These statements are based on current expectations, forecasts and assumptions, and actual outcomes and results could differ materially from these statements due to a number of factors. These and additional risks and uncertainties that could affect Guardant Health’s financial and operating results and cause actual results to differ materially from those indicated by the forward-looking statements made in this press release include those discussed under the captions "Risk Factors" and "Management’s Discussion and Analysis of Financial Condition and Results of Operation" and elsewhere in its Annual Report on Form 10-K for the year ended December 31, 2025 and in its other reports filed with or furnished to the Securities and Exchange Commission. The forward-looking statements in this press release are based on information available to Guardant Health as of the date hereof, and Guardant Health disclaims any obligation to update any forward-looking statements provided to reflect any change in its expectations or any change in events, conditions, or circumstances on which any such statement is based, except as required by law. These forward-looking statements should not be relied upon as representing Guardant Health’s views as of any date subsequent to the date of this press release. View source version on businesswire.com: https://www.businesswire.com/news/home/20260528810245/en/ Contacts Investor Contact: Zarak Khurshid [email protected] Media Contact: Meaghan Smith [email protected]

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