Updated project metadata. In order to detect proteins sensitive and specific enough to detect early stages of PCa, we performed a complex comparative proteomic study analyzing urine as a source for non-invasive biomarkers. We compared urine samples from patients with early PCa stages and Gleason score between 6 and 7 with samples from patients with BPH and other urological cancers, namely bladder and renal. The main goal of this study was to discover a diagnostic biomarker or set of biomarkers in urine, sufficiently sensitive to detect PCa in its early stages and specific enough to separate the disease from BPH or other urological cancers.