US STOCKS-Earnings, healthcare give Wall St sixth straight gain By: Reuters: Company News April 22, 2014 at 17:26 PM EDT * Dow up 0.4 pct; S&P 500 up 0.4 pct; Nasdaq up 1 pct (Adds Gilead earnings, updates volume) Read More >> Related Stocks: Alaska Air Group Eli Lilly Facebook General Motors Gilead Sciences Gsk Plc ADR McDonald's Corp Netflix Novartis Ag ADR TravelersCompanies United Technologies Valeant Pharmaceuticals International, Inc.