Differences in TNM Staging with Regard to CT vs. PET vs. PET/CT
| Group | TNM | CT-positive | PET-positive | PET/CT-positive |
| All patients (n = 172) | T+ (primary tumor/local recurrence) | 31 (18%) | 58 (34%)* | 63 (37%)* |
| N1 | 36 (21%) | 71 (41%)* | 76 (44%)* | |
| M1a | 8 (5%) | 13 (8%) | 17 (10%)* | |
| M1b | 5 (2%) | 15 (9%)* | 15 (9%)* | |
| PSA recurrence (n = 62) | T+ (recurrence) | 6 (10%) | 15 (24%)* | 18 (29%)* |
| N1 | 7 (11%) | 14 (23%)* | 14 (23%)* | |
| M1a | 1 (2%) | 1 (2%) | 1 (2%) | |
| M1b | — | 1 (2%) | 1 (2%) | |
| PSA persistence (n = 88) | T+ (recurrence) | 14 (16%) | 25 (28%)* | 26 (30%)* |
| N1 | 25 (28%) | 48 (55%)* | 53 (60%)* | |
| M1a | 6 (7%) | 10 (11%) | 13 (15%)* | |
| M1b | 5 (6%) | 14 (16%)* | 14 (16%)* | |
| Definitive RT (n = 22) | T+ (primary tumor) | 11 (50%) | 18 (82%)* | 19 (86%)* |
| N1 | 4 (18%) | 9 (41%) | 9 (41%) | |
| M1a | 1 (5%) | 2 (10%) | 3 (14%) | |
| M1b | — | — | — |
↵* P < 0.05 compared with CT imaging (McNemar test).
N1 = regional lymph node metastases; M1a = distant lymph node metastases; M1b = distant metastases; RT = radiotherapy.