Table 1. Characteristics of Patient Cases.
| Characteristic | Training set | Test set | Matched set | Adjuvant set |
| Number | 153 | 155 | 20 | 20 |
| Age at prostatectomy | 65.7 | 64.2 | 66.5 | 63 |
| Median Preoperative PSA (ng/ml) | 10.25 | 9.5 | 15.4 | 8.4 |
| Surgery | ||||
| Open RP | 133 (86.9%) | 43 (27.7%) | 13 (65%) | 19 (95%) |
| Robot-assisted laparoscopic RP | 19 (12.4%) | 112 (72.3%) | 7 (35%) | 0 |
| Open radical cystoprostatectomy | 0 | 0 | 0 | 1 (5%) |
| Unknown | 1 (0.7%) | 0 | 0 | 0 |
| Years of surgery | 1990–2009 | 2000–2011 | 1992–2009 | 2000–2006 |
| Lymph Node Status | ||||
| N0 | 137 (89.5%) | 136 (87.7%) | 6 (30%) | 4 (20%) |
| N1 | 16 (10.5%) | 19 (12.3%) | 14 (70%) | 15 (75%) |
| Insufficient data | 0 | 0 | 0 | 1 (5%) |
| Extraprostatic Extension | ||||
| No | 66 (43.1%) | 27 (17.4%) | 8 (40%) | 6 (30%) |
| Yes | 87 (56.9%) | 128 (82.6%) | 12 (60%) | 13 (65%) |
| Insufficient data | 0 | 0 | 0 | 1 (5%) |
| Surgical margins Positive | ||||
| No | 72 (47.1%) | 87 (56.1%) | 9 (45%) | 9 (45%) |
| Yes | 81 (52.9%) | 68 (43.9%) | 11 (55%) | 11 (55%) |
| Seminal Vesicles Invasion | ||||
| No | 131 (85.6%) | 93 (60%) | 13 (65%) | 12 (60%) |
| Yes | 22 (14.4%) | 62 (40%) | 7 (35%) | 7 (35%) |
| Insufficient data | 0 | 0 | 0 | 1 (5%) |
| Gleason Score | ||||
| 2–6 | 36 (23.5%) | 13 (8.4%) | 1 (5%) | 2 (10%) |
| 7 (3+4) | 61 (39.9%) | 54 (34.8%) | 5 (25%) | 2 (10%) |
| 7 (4+3) | 25 (16.3%) | 35 (22.6%) | 5 (25%) | 4 (20%) |
| 8–10 | 31 (20.3%) | 53 (34.2%) | 9 (45%) | 12 (60%) |