Have you been paying attention to shares of United Therapeutics (UTHR) ? Shares have been on the move with the stock up 11.6% over the past month. The stock hit a new 52-week high of $330 in the previous session. United Therapeutics has gained 46.2% since the start of the year compared to the 7.5% move for the Zacks Medical sector and the -3.5% 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 ...