The University of Michigan's Arul Chinnaiyan has led a study that identified several biomarkers for advanced stage prostate cancer, says an article at BBC. The researchers examined 1,126 molecules in a total of 262 samples of tissue, blood, or urine, and found one metabolite, sarcosine, to be a better predictor of late-stage disease than PSA. While a simple urine test is still around five years away, they say, it's promising work.