Preparations are under way for the the American Cancer Society's annual Relay for Life fund raiser in Tucson. The event is scheduled for May 18 and 19 at Empire High School in Vail.

International experts say cancer kills more people each year than any other affliction, so many doctors and scientists are working on possible cures and treatments even though resources are usually limited.

The relay's proceeds support that work, involving volunteer teams that commit to having representatives from their groups taking turns walking or running a track for 24 hours.

Cancer survivor Jennifer Fishencord, a volunteer with the Tucson/Vail Relay for Life, says the teams usually consist of seven to 10 people.

"The idea is that cancer doesn't sleep, so for one night we won't either," Fishencord says.