The incidence of colorectal cancer and colonic polyps is monitored in the Longitudinal Study of Astronaut Health (LSAH) participants. It is believed that astronauts could be at increased risk for colorectal cancer because if their unique exposures, particularly radiation exposure.
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Data for the astronaut participants and a group of comparison participants were obtained from the LSAH database.
No increased incidence in colorectal cancer or colonic polyps has been observed in astronaut participants when compared to the comparison population.