US STOCKS-Futures flat after six straight days of gains
* S&P 500, Nasdaq on six-day winning streak as of Tuesday
* Gilead Sciences rises in premarket after results
* Key earnings on tap; Apple, Facebook out after the close
* Futures down: Dow 5 pts, S&P 2.1 pts, Nasdaq 7 pts
By Ryan Vlastelica
NEW YORK, April 23 (Reuters) - U.S. stock index futures were flat on Wednesday as investors found few reasons to keep buying following six straight days of gains on both the S&P 500 and Nasdaq.
* Equities have recently been boosted by corporate earnings, with a number of prominent names topping expectations, though companies have largely been beating reduced forecasts. According to Thomson Reuters data, profits are seen rising 1.1 percent this quarter, down from the 6.5 percent growth rate estimated at the start of the year.
* Gilead Sciences Inc rose 3.8 percent to $75.60 in heavy premarket trading a day after the drugmaker reported a sharp increase in its quarterly profit, helped by sales of its hepatitis C drug. Gilead's results, like those of Netflix Inc , showed there was still room to grow in high-flying names that recently plunged on signs of excessive valuation.
* Shares of Boeing Co rose 2.3 percent to $130.50 after the planemaker reported its first-quarter results and raised its full-year outlook for core earnings. Continuación...