By Robert Bazell
NBC News correspondent
Tonight on “NBC Nightly News” we heard the story of Zach Witt, a vivacious 6-year-old who was close to death from a rare form of lymphoma. But he was brought back to health by a drug that has been on the market as a treatment for a form of lung cancer. It truly is a heartening tale.
The backstory to this achievement shows how… WATCH THE VIDEO AT: http://dailynightly.msnbc.msn.com/_news/2012/05/16/11734962-lung-cancer-drug-treats-rare-lymphoma-tumors-too?lite