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Rectal cancer rates increase in people under 40, researchers say
Los Angeles Times

Rates of rectal cancer in people younger than 40, although low, have been rising steadily for the last 20 years for reasons that are mystifying scientists, researchers said Sunday. Both colon cancer and rectal cancer are thought to share the same risk factors, but the incidence of colon cancer has remained steady during that period, while the incidence of rectal cancer has grown by an average of 3.8% per year, scientists reported online in the journal Cancer.