To determine whether patients with Gleason score 5 + 3 = 8 prostate cancer have outcomes more similar to other patients with Gleason score 8 disease or to patients with Gleason score 9 disease.
The Surveillance, Epidemiology and End Results (SEER) database was used to study 40 533 men diagnosed with N0M0 Gleason score 8 or 9 prostate cancer from 2004 to 2011.