David Neal1, Hans Lilja2. 1. Nuffield Department of Surgical Sciences, University of Oxford, Oxford, UK. 2. Nuffield Department of Surgical Sciences, University of Oxford, Oxford, UK; Departments of Laboratory Medicine, Surgery (Urology), and Medicine (Genitourinary Oncology), Memorial Sloan Kettering Cancer Center, New York, NY, USA; Department of Laboratory Medicine, Lund University, University Hospital UMAS, Malmö, Sweden. Electronic address: liljah@mskcc.org.