By Dr. Graham A. Colditz Siteman Cancer Center Most of us have been touched by cancer in some way. Maybe we have friends or family who’ve been diagnosed, or maybe you’re one of the 18 million people in the U.S. living as a cancer survivor. Given cancer’s seriousness, its extent can certainly feel concerning, especially as the number of cancer survivors is expected to grow to over 22 million within the next 10 years. But there is actually some good news to go along with these large numbers.