DENVER (CBS4) – Runners will be filling downtown Denver for Saturday’s Sports Authority Rock ‘n’ Roll Denver Marathon & ½ Marathon.

About 15,000 people are expected to hit the course. They registered on Friday at the Colorado Convention Center.

The Rock ‘n’ Roll Marathon is a lot of fun but it’s also raising money for prostate cancer research.

After Dan Zenka with the Prostate Cancer Foundation joined the organization he was diagnosed with the disease himself.

“It didn’t come as any surprise. Prostate cancer is to men what breast cancer is to women,” Zenka said. “Alone in the U.S. we’ll have 28,000 American men die from the disease this year; and worldwide 16 million men and their families are affected by this disease.”

Every mile along the race will feature a different band.

The marathon starts at Civic Center Park at 7:15 a.m. and CBS4 is a proud sponsor.

LINKS: Rock ‘n’ Roll Denver Bike Tour | Sports Authority Rock ‘n’ Roll Denver Marathon & 1/2 Marathon

PHOTO GALLERY: See Images From The 2011 Race