The biotech sector has had an amazing run in 2014 and you could say that Gilead Sciences, Inc. (NASDAQ:GILD) has lead the charge. The biopharma company is up roughly 40% year to date, and this is after an amazing 100% return for investors in 2013. One could say this is a can't miss stock and rewards its shareholders extremely well. I am not trying to take anything away from the run that Gilead Sciences, Inc. (NASDAQ:GILD) has had. However, looking at the weekly chart I am seeing a bearish pattern being formed and this indicates to me, that there will be downside in the near future. The candlestick that has developed on the chart below is called, a "bearish engulfing candle" and it points to further weakness ahead. So how far can Gilead fall? The first meaningful level that I see is $84, as that is not only the break out area which lead to the recent run up to the all time high of $110.64. But there are also some key proprietary factors which should provide longs a 10% bounce. So while this level may seem like it's far away, know this, the biotech sector can be extremely volatile and this level could be achieved easily in weeks, if not days.