Table 4. Summary of surveillance CT scan and endoscopy.
| All Patients | R0 Patients | R1 Patients | |||||
|---|---|---|---|---|---|---|---|
| Pts N (%) | Screens N | Pts N (%) | Screens N | Pts N (%) | Screens N | ||
| All Patients | 246 | 212 | 29 | ||||
| CT Scans | |||||||
| All CT Scans* | 228 (93%) | 1053 | 196 (92%) | 916 | 29 (100%) | 126 | |
| All Scans Negative | 147 (60%) | 730 | 132 (62%) | 663 | 13 (45%) | 57 | |
| Any Negative (But Not All) | 63 (26%) | 224 | 51 (24%) | 179 | 12 (41%) | 45 | |
| Any Suspicious** | 47 (19%) | 56 | 38 (18%) | 44 | 9 (31%) | 12 | |
| Negative | 18 | 17 | 1 | ||||
| Positive | 31 | 23 | 8 | ||||
| Suspicious | 7 | 4 | 3 | ||||
| Any Positive | 43 (17%) | 43 | 30 (14%) | 30 | 12 (41%) | 12 | |
| Endoscopy | |||||||
| All Endoscopies* | 164 (67%) | 403 | 144 (68%) | 349 | 19 (66%) | 48 | |
| All Endoscopy Negative | 161 (65%) | 399 | 143 (67%) | 348 | 17 (59%) | 45 | |
| Ever Positive*** | 3 (1%) | 4 | 1 (0%) | 1 | 2 (7%) | 3 | |
| Match**** | |||||||
| All Match Screens | 150 (61%) | 321 | 131 (62%) | 277 | 18 (62%) | 39 | |
| All Consistent Negative | 117 (48%) | 255 | 103 (49%) | 218 | 13 (45%) | 32 | |
| All Consistent Ever Positive*** | 2 (1%) | 3 | 0 (0%) | 0 | 2 (7%) | 3 | |
| Mismatched | 31 (13%) | 63 | 28 (13%) | 59 | 3 (10%) | 4 | |
*All CT scans and all endoscopies include those done within 5.5 years after resection date with the following exceptions: a) scans done more than 45 days after relapse, or b) any CT scan after a positive CT scan was excluded from this study.
**The resolution of the suspicious CT scan was defined by these rules in the following order:
Step 1: If this suspicious result was found within 60 days before or 45 days after relapse, it was defined as “Positive”.
Step 2: Define by using the next CT scan results.
Step 3: If specific keywords (such as metastasis, mets, chemo and positive) were found in the intervention or comment, then it was defined as “Positive”. Similarly, if specific keywords (such as negative) were found in the intervention or comment, then it was defined as “Negative”.
***This includes all endoscopies for patients with any positive endoscopy, so “additional screens” includes the negatives received prior to the positive.
****We matched each screening endoscopy with a CT scan done within 45 days. If there were multiple CTs available, then the nearest one was selected.