Table 2.
Operative data and pathologic outcomes
| Variable | ypT0N0 (n = 111) | Residual disease (n = 469) | P-value |
|---|---|---|---|
| Operative name | 0.241 | ||
| Low anterior resection | 64 (57.7) | 242 (51.6) | |
| Ultralow anterior resection | 40 (36.0) | 189 (40.3) | |
| Abdominoperineal resection | 7 (6.3) | 38 (8.1) | |
| Operative time (min) | 185 (93–528) | 200 (50–740) | 0.392 |
| Surgical approach | 0.260 | ||
| Open | 75 (67.6) | 350 (74.6) | |
| Laparoscopy | 34 (30.6) | 112 (23.9) | |
| Robot | 2 (1.8) | 7 (1.5) | |
| Postoperative hospital stay (day) | 9 (5–22) | 9 (1–57) | 0.624 |
| Pathologic AJCC | |||
| Stage 0 | 111 (100) | N/A | |
| Stage I | N/A | 151 (32.2) | |
| Stage II | N/A | 162 (34.5) | |
| Stage III | N/A | 156 (33.3) | |
| Pathologic T classification | |||
| ypT0 | 111 (100) | 4 (0.9) | |
| ypT1 | N/A | 36 (7.7) | |
| ypT2 | N/A | 150 (32.0) | |
| ypT3 | N/A | 273 (58.2) | |
| ypT4 | N/A | 6 (1.3) | |
| Pathologic N classification | |||
| ypN0 | 111 (100) | 313 (66.7) | |
| ypN1 | N/A | 124 (26.4) | |
| ypN2 | N/A | 32 (6.8) | |
| Median No. of harvested LNs (range) | 13 (1–34) | 13 (1–43) | 0.411 |
| Circumferential resection margin | 0.144 | ||
| Negative | 0 (0) | 13 (2.8) | |
| Positive | 111 (100) | 456 (97.2) |
Values are presented as number (%) or median (range).
AJCC, American Joint Committee on Cancer; LNs, lymph nodes.