Characteristics of 73 Patients Included in Study
| Characteristic | n | % |
| Age (y)* | ||
| <60 | 46 | 63 |
| 60–70 | 15 | 20.5 |
| >70 | 12 | 16.5 |
| Sex | ||
| Female | 33 | 45.2 |
| Male | 40 | 54.8 |
| Tumor location | ||
| Colon | 48 | 65.8 |
| Anorectal | 25 | 34.2 |
| Histology | ||
| Adenocarcinoma | 55 | 75.3 |
| Squamous cell carcinoma | 14 | 19.2 |
| Unknown | 4 | 5.5 |
| Tumor differentiation | ||
| Well differentiated | 3 | 4.1 |
| Moderately differentiated | 43 | 58.9 |
| Poorly differentiated | 11 | 15.1 |
| Unknown | 16 | 21.9 |
| Stage | ||
| I | 2 | 2.7 |
| II | 9 | 12.3 |
| III | 20 | 27.4 |
| IV | 35 | 47.9 |
| Unknown | 7 | 9.6 |
| CEA level before PET/CT scan | ||
| Elevated | 31 | 42.5 |
| Normal | 10 | 13.7 |
| Unknown | 32 | 43.8 |
| Last treatment | ||
| Surgery | 25 | 34.2 |
| Radiation | 2 | 2.7 |
| Chemotherapy | 37 | 50.7 |
| Chemoradiation | 9 | 12.3 |
| PET/CT outcome | ||
| Negative | 20 | 27.4 |
| Positive | 53 | 72.6 |
| Outcome | ||
| Alive | 39 | 53.4 |
| Dead | 34 | 46.6 |
*Mean ± SD, 56 ± 11 y.