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Guardant Health, Inc., a precision oncology company, provides blood tests, data sets, and analytics in the United States and internationally. The company offers Guardant360; Guardant360 LDT; Guardant360 CDx; Guardant360 Response Test; Guardant360 TissueNext Test; GuardantINFINITY Test; GuardantConnect, an integrated software-based solution designed for clinical and biopharmaceutical customers to connect patients tested with assays with actionable alterations with potentially relevant clinical studies; GuardantOMNI Test for advanced stage cancer; and GuardantINFORM, an in-silico research platform for tumor evolution and treatment resistance across various biomarker-driven cancers. It also offers Shield Test; Guardant Reveal Test for neoadjuvant and adjuvant treatment selection in early-stage cancer patients; Smart Liquid Biopsy Platform; and Guardant Galaxy, a suite of advanced analytical technologies to enhance the performance and clinical utility of cancer tests. Further, it offers development services, including companion diagnostic development and regulatory approval, clinical study setup, monitoring and maintenance, testing development and support, and kits fulfillment related services to biopharmaceutical companies and medical institutions. Guardant Health, Inc. has a research collaboration agreement with the Parker Institute for Cancer Immunotherapy to study the correlation between molecular cancer biomarkers and patient response to immunotherapy treatment across various types of cancer. The company was incorporated in 2011 and is headquartered in Palo Alto, California.