Hackers may have had access to personal information for about 600 University of California-San Francisco patients as a result of an Internet "phishing" scam, campus officials said. The security breach occurred in September when a faculty physician in the UCSF School of Medicine provided a user name and password in response to a scam e-mail message. The e-mail had been sent by hackers and made to look as though it came from UCSF workers who are responsible for upgrading security on internal computer servers, the San Francisco Chronicle reports. The patients have all been notified of the security breach.