The American Cancer Society wants you.

If you’ve never had cancer and you’re between the ages of 30 and 65, you can be a volunteer for a national study that could help figure out which factors, such as lifestyle, environment and genetics, cause or prevent cancer.

The study aims to enroll 300,000 people nationwide, and recruiters are coming to nine sites in the Greater Charlotte area this week. They hope to enroll 1,600 people over those four days.

Those interested should register online for appointments. About 1,000 have already done so.

Dates, times and sites are:

• Tuesday, 4 to 7 p.m., and Wednesday, 6:30 to 10 a.m., Huntersville Family Fitness and Aquatics, 11725 Verhoeff Drive, Huntersville.

• Tuesday, 4 to 7:30 p.m., and Thursday, 9 a.m. to 12:30 p.m., Levine Senior Center, 1050 DeVore Lane, Matthews.

• Wednesday, 10 a.m. to 1:30 p.m., Wells Fargo Atrium, 301 S. Tryon St., uptown Charlotte

• Wednesday, 10 a.m. to 1:30 p.m., YMCA Corporate Wellness Center, 15830 John J. Delaney Drive, Suite 150, Charlotte.

• Tuesday, 4 to 7:30 p.m., and Saturday, 9 a.m. to 12:30 p.m., West Cabarrus YMCA, 5325 Langford Ave., Concord.

• Thursday, 10 a.m. to 1:30 p.m., American Cancer Society, 1901 Brunswick Ave., Suite 100, Charlotte.

• Saturday, 9 a.m. to 12:30 p.m., Friendship Missionary Baptist Church, 3400 Beatties Ford Road, Charlotte.

• Saturday, 9 a.m. to 12:30 p.m., Weddington United Methodist Church, 13901 Providence Road, Weddington.

• Saturday, 11 a.m. to 1:30 p.m., Monroe Crossing Mall, Sears wing, 2115 Roosevelt Blvd., Monroe.

Participants will be asked to complete a survey and give a blood sample.

But it’s a long-term commitment.

Over the next 20 to 30 years, volunteers will be asked to fill out a survey every two or three years. Their blood will be stored so that, if participants develop cancer later, it can be analyzed for markers that might give clues about cause or prevention.

“We have made great strides in treating cancer, but we still don’t know how to prevent it,” said Denise Goodwin-Hockaday, a director with the cancer society’s South Atlantic Division, based in Charlotte.

So far, the study has enrolled 185,000 people, and enrollment will close at the end of 2013.

Spokeswoman Kari Dahlstrom said many of the locations, such as churches, have a “built-in community. But she emphasized the uptown location at the Wells Fargo atrium. “It only takes about 45 minutes to enroll. People can do it during their workday downtown,” she said.

Appointments are encouraged, but walk-ins will be accepted.

“We don’t want to turn people away if they’re interested,” Dahlstrom said.

To make an appointment to enroll: 888-604-5888, www.cps3greatercharlotte.org.

For other information: Denise Goodwin-Hockaday, 704-553-5362, denise.goodwinhockaday@cancer.org.