There may be a link between early-onset colorectal cancer — colon or rectal cancer diagnosed before age 50 — and time spent sitting and watching television, suggests a study published in JNCI Cancer Spectrum. Colorectal cancer rates are rising throughout the world, primary in older adults. Early-onset disease is typically more aggressive and diagnosed at a later stage.
Researchers looked at time spent watching TV and other sedentary behaviors in 89,278 women in the United States who were part of the Nurses' Health Study II, 118 of whom developed early-onset colorectal cancer. According to the researchers, one hour of TV viewing daily was associated with a 12 percent higher risk of the disease, while two hours a day increased the colorectal cancer risk by nearly 70 percent.
They also found that the higher early-onset colorectal cancer risk was not related to other factors, such as body mass index (BMI), exercise habits, or family history of the disease. Rectal cancer risk is higher than colon cancer risk, according to the researchers, who were from Washington University School of Medicine in St. Louis.
Sourced from: JNCI Cancer Spectrum