March 24, 2017
(Science) – How much of cancer is due to random “bad luck”? More than 2 years ago, a pair of researchers brought that question to prominence when they tried to sort out environmental versus inherited causes of cancer. They examined the extent to which stem cell divisions in healthy cells—and the random mutations, or “bad luck” that accumulate—drive cancer in different tissues. Their effort, which implied that cancer was harder to prevent than hoped and that early detection was underappreciated, sparked controversy and confusion. Now, the researchers are back with a sequel: a new paper that aims to parse “bad luck” risks by cancer type, and that brings in cancer data from other countries.