Zac Efron, Vanessa Hudgens Stand Up to Cancer in new PSA

Young Hollywood is determined to beat cancer.

That's why over a dozen stars took part in the newest Stand Up to Cancer PSA, including Kristen Bell, Zac Efron, Dakota Fanning, Vanessa Hudgens, Olivia Munn, Aubrey Plaza, Donald Faison, and Jon Heder.

The "Change The Odds" PSA  will help raise awareness and funds for innovative cancer research. It's co-directed by Marc Webb ("500 Days of Summer," Untitled "Spider Man" Reboot) and Rich Lee, and produced by Laura Ziskin and Pam Williams.
"Change the Odds" puts cancer into frightening perspective. The odds of certain events are quite low -- becoming an astronaut (1 in 13,200,000) or getting trapped in an elevator (1 in 24,528). But this is in sharp contrast with the odds of getting cancer. Ready for the bad news? In the US, 1 in 2 men and 1 in 3 women will be diagnosed with cancer in their lifetimes.