 REDWOOD CITY, Calif.--BUSINESS WIRE--Guardant Health, Inc. Nasdaq: GH, a leading precision oncology company, today filed a lawsuit against Natera, Inc. for false advertising, unfair competition, and unlawful trade practices, relating to misleading statements Natera has made about its own products and the performance of Guardant Healths new oncology test, Guardant RevealTM. Guardant Health asked the federal court in San Francisco, California for an injunction preventing Natera from continuin 