For the first time ever, scientists have used the CRISPR/cas9 gene-editing tool (or as they dubbed it "powerful DNA cut-paste tool") to successfully treat Duchenne muscular dystrophy, a genetic muscle disorder in a living adult mammal. It’s a promising medical breakthrough that could soon lead to human therapies.
http://ieet.org/index.php/IEET/more/dvorsky20160122
http://ieet.org/index.php/IEET/more/dvorsky20160122