SAN FRANCISCO - AUGUST 18: Registered nurse Jnani Chapman teaches a yoga class geared towards cancer patients at the UCSF Comprehensive Cancer Center August 18, 2005 in San Francisco, California. The UCSF Comprehensive Cancer Center continues to use the latest research and technology to battle cancer and was recently rated 16th best cancer center in the Nation by US News and World Report. (Photo by Justin Sullivan/Getty Images)
