FILE - In this Sept. 13, 2011 photo provided by the University of Chicago Medical Center, a doctor watches an internal video of the patient’s body as he assists in prostate cancer surgery at the University of Chicago Medical Center in Chicago. Scientists from Flinders University in Australia and South China University of Technology found that two enzymes, PDIA1 and PDIA5, play a role in helping prostate cancer cells grow, survive and resist treatment. (AP Photo/University of Chicago Medical Center, Bruce Powell)