A teenager with a rare cancer who was twice sent home to die is defying doctors after new scans showed his latest treatment is working. A major community fundraiser was launched to pay for the treatment after Dan Evans, 18, of Newark, was told he had exhausted all avenues available on the NHS. But money was not needed when the NHS agreed to fund the combination of drugs – which had proved successful in trials – for Dan. And his first scan since starting the treatment last month showed that Dan’s cancer had cleared from many areas in his body, including his liver, large portions of the lungs an…