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A cancer risk factor is anything that increases a person’s risk of developing cancer. Non-modifiable cancer risk factors include age, sex, race and ethnicity, family history, and genetics (e.g., changes in DNA). Modifiable cancer risk factors include health behaviors and lifestyle factors (e.g., tobacco and alcohol use, obesity). Environmental risk factors for cancer such as radiation, infectious agents, and workplace exposures may be non-modifiable or modifiable. Cancer Risk Factors presents non-modifiable, modifiable, and environmental risk factors by cancer site/type.