Have you been paying attention to shares of Tenet Healthcare (THC) ? Shares have been on the move with the stock up 7.1% over the past month. The stock hit a new 52-week high of $151 in the previous session. Tenet Healthcare has gained 92.3% since the start of the year compared to the 7.3% move for the Zacks Medical sector and the 27.4% return for the Zacks Medical - Hospital industry.What's Driving the Outperformance?The stock has a great record of positive earnings surprises, as it hasn't missed our earni ...