Coloradans are being asked to join a cancer prevention study being conducted by the American Cancer Society.

The goal of the Cancer Prevention Study (CPS-3) is to better understand ways to prevent cancer, according to the American Cancer Society.

"Once a person has cancer, the body has been affected by the disease, treatment, and/or lifestyle changes as a result of the diagnosis. For this reason, we strongly encourage individuals without a history of cancer to enroll," the study website said.

Researchers are looking for people 30 to 65 years old, with no personal history of cancer who are willing to make a long-term commitment to the study. Long-term commitment means 20 years or longer.

Researchers are hoping to enroll at least 300,000 people from various racial/ethnic backgrounds.

Enrollment in the study is expected to take about 30 minutes per person. Volunteers will be asked to sign a consent form, complete a survey, get a waist measurement and have a blood sample taken.

Enrollment is free and will take place at the Westin Hotel in Westminster on October 26-27 as well as various locations throughout the Denver Metro area November 13 – 17, 2012.

Get the list of Denver metro area enrollment sites here. Learn more about the study on the American Cancer Society's website.