PALO ALTO, Calif.--(BUSINESS WIRE)--Guardant Health, Inc. (Nasdaq: GH), a leading precision oncology company, announced today that new data from its portfolio of blood tests will be presented at the ASCO 2023 Gastrointestinal Cancers Symposium, January 19-21 in San Francisco. The 10 poster presentations highlight the use of the Guardant360® and...