Shares of Rigel Pharmaceuticals (RIGL) have been strong performers lately, with the stock up 56.6% over the past month. The stock hit a new 52-week high of $30.43 in the previous session. Rigel has gained 77.2% since the start of the year compared to the -7.6% gain for the Zacks Medical sector and the 5.6% return for the Zacks Medical - Drugs industry.What's Driving the Outperformance?The stock has a great record of positive earnings surprises, as it hasn't missed our earnings consensus estimate in any of ...