Abstract
Educational attainment is a social determinant of health and frequently used as an indicator of socioeconomic status. Educational attainment is a predictor of cancer mortality, but associations with site-specific cancer incidence are variable. The aim of this study was to evaluate the association of educational attainment and site-specific cancer incidence adjusting for known risk factors in a large prospective cohort. Men and women enrolled in the American Cancer Society's Cancer Prevention Study-II Nutrition Cohort who were cancer free at baseline were included in this study (n = 148,965). Between 1992 and 2017, 22,810 men and 17,556 women were diagnosed with incident cancer. Cox proportional hazards regression models were used to estimate age- and multivariable-adjusted risk and 95% confidence intervals of total and site-specific cancer incidence in persons with lower versus higher educational attainment. Educational attainment was inversely associated with age-adjusted cancer incidence among men but not women. For specific cancer sites, the multivariable-adjusted risk of cancer in the least versus most educated individuals remained significant for colon, rectum, and lung cancer among men and lung and breast cancer among women. Educational attainment is associated with overall and site-specific cancer risk though adjusting for cancer risk factors attenuates the association for most cancer sites. This study provides further evidence that educational attainment is an important social determinant of cancer but that its effects are driven by associated behavioral risk factors suggesting that targeting interventions toward those with lower educational attainment is an important policy consideration.
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