FOSTER CITY, Calif.--(BUSINESS WIRE)--Jan. 12, 2016-- Gilead Sciences, Inc. (Nasdaq:GILD) today announced that it has submitted a New Drug Application (NDA) to the U.S. Food and Drug Administration (FDA) for tenofovir alafenamide (TAF) 25 mg, an investigational, once-daily treatment for adults with chronic hepatitis B virus (HBV) infection.