Have you been paying attention to shares of CareDx (CDNA) ? Shares have been on the move with the stock up 73.7% over the past month. The stock hit a new 52-week high of $27.47 in the previous session. CareDx has gained 128.3% since the start of the year compared to the 6.6% move for the Zacks Medical sector and the 4.1% return for the Zacks Medical Services industry.What's Driving the Outperformance?The stock has a great record of positive earnings surprises, as it hasn't missed our earnings consensus esti ...