Has cancer just been cured?
In this Jan. 12, 2013 photo provided by the family, Doug Olson, right, and his son, Jon, stand together after running a half-marathon in Orlando, Fla. As of December 2013, Doug Olson, 67, a scientist for a medical device maker, shows no sign of cancer since gene therapy in September 2010 for chronic lymphocytic leukemia he had had since 1996. "Within one month he was in complete remission. That was just completely unexpected. He probably had about 4 pounds of tumor that was eradicated in 30 days," said Porter, his doctor at U Penn. (AP Photo/Margit Olson)