Burton Dickey, M.D., doesn't slow down. The chair of MD Anderson's Department of Pulmonary Medicine runs three miles four times a week, even after a cancer diagnosis in October followed by a stem cell transplant last month. 

The 59-year-old says he didn't have any symptoms. The only thing he noticed was his running pace was a little slower.

A multiple myeloma diagnosis
After a routine blood test, his cardiologist...