Table 5. Pathologic Outcomes.
| Outcome | No. (%) | P Value | |
|---|---|---|---|
| Study Cases (n = 113) | Historical Control (n = 113) | ||
| Tumor type | |||
| Benign | 2 (1.8) | 1 (0.9) | .85 |
| Premalignant | 2 (1.8) | 2 (1.8) | |
| Malignant | 108 (96.4) | 109 (97.3) | |
| Resection margin, mm | |||
| <5 | 7 (7.1) | 9 (9.6) | .73 |
| 6-9 | 3 (3.0) | 4 (4.3) | |
| ≥10 | 89 (89.9) | 81 (86.2) | |
| Tumor size, median (IQR), cm | 3.7 (1.9) | 3.5 (1.9) | .59 |
| Total lymph node yield, median (IQR), No. | 17.7 (10.1) | 16.8 (7.4) | .94 |
| Tumor-positive lymph nodes, median (IQR), No. | 0.9 (2.2) | 1.0 (2.0) | .28 |
| pT categorya | |||
| pT0 | 3 (2.8) | 2 (1.9) | .87 |
| pT1 | 16 (14.7) | 24 (13.0) | |
| pT2 | 30 (27.5) | 29 (26.9) | |
| pT3 | 53 (48.6) | 52 (48.1) | |
| pT4 | 7 (6.4) | 11 (10.2) | |
| pN categoryb | |||
| pN0 | 80 (72.7) | 74 (66.7) | .44 |
| pN1 | 23 (20.9) | 25 (22.5) | |
| pN2 | 7 (6.4) | 12 (10.8) | |
Abbreviations: IQR, interquartile range; pN, pathologic evaluation of regional lymph nodes; pT, pathologic evaluation of primary tumor.
a
For pT categories, T0 indicates no evidence of primary tumor; T1, tumor invades submucosa; T2, tumor invades muscularis propria; T3, tumor invades through the muscularis propria into pericolorectal tissues; and T4, tumor penetrates to the surface of the visceral peritoneum or directly invades or is adherent to other organs or structures.
b
For pN categories: N0 indicates no regional lymph node metastasis; N1, metastasis in 1 to 3 regional lymph nodes; and N2, metastasis in 4 or more regional lymph nodes.