Grouped according to the risk of recurrence Limited low-risk group (T1-T2a, and Gleason score 2-6, and PSA < 10ng/ml); limited intermediate-risk group (T2b-T2c, or Gleason score 7, or PSA 10-20ng/ml); limited high-risk group (T3a, or Gleason score 8-10, or PSA > 20ng/ml); limited late-risk group (T3b-T4); metastatic group (N1,or M1).