“A risk factor is anything that increases your chance of getting a disease such as cancer. Different cancers have different risk factors. Some risk factors, like smoking, can be changed. Others, like a person’s age or family history, can’t be changed. In some cases, there is unknown etiology why the person got pancreatic cancer.
Having a risk factor, or even many, does not mean that you will get cancer. And some people who get cancer may have few or no known risk factors.”
American Cancer Society