Cobb residents between the ages of 30 and 65 who have never been diagnosed with cancer are needed to participate in the American Cancer Society’s Prevention Study-3.

The study is designed to help researchers better understand the lifestyle, environmental and genetic factors that cause or prevent cancer.

Residents can enroll March 24-31 at the American Cancer Society office, 1825 Barrett Lakes Blvd. in Kennesaw or at Creekside Centre@Infomart, 1582 Terrell Mill Rd. in Marietta.

The study will ultimately include a half a million people across the country and Puerto Rico.

For more information, visit www.cancer.org/cps3, or call 1-888-604-5888.