Biochemical Parameters of Patients with 18F-DOPA PET (Group B)
| Parameter | 18F-DOPA PET–positive (n = 16) | 18F-DOPA PET–negative (n = 20) | P |
| Calcitonin (ng/L) | <0.001 | ||
| Median | 3,626 | 287 | |
| Range | 88–240,325 | 17.8–2,320 | |
| CEA* (μg/L) | <0.001 | ||
| Median | 36.6 | 6.6 | |
| Range | 1.2–2,620 | 0.5–72 | |
| Calcitonin doubling time (mo) | Not significant | ||
| <24 | 8 (50) | 5 (25) | |
| >24 | 8 (50) | 15 (75) | |
| CEA† doubling time (mo) | Not significant | ||
| <24 mo | 4 (27) | 1 (5) | |
| >24 mo | 11 (73) | 19 (95) | |
| Calcitonin and CEA doubling time (mo) | Not significant | ||
| Calcitonin or CEA, <24 | 9 (56) | 5 (25) | |
| Calcitonin and CEA, >24 | 7 (44) | 15 (75) |