Table 4.
Post-operative pathological outcome
| RACRS | LCRS | P value | |
|---|---|---|---|
| pTNM (overall), %(n/ntotal)a | |||
| 0b | 1.9% (4/206) | 0.0% (0/172) | 0.115 |
| I | 38.8% (80/206) | 33.1% (57/172) | |
| II | 25.2% (52/206) | 32.6% (56/172) | |
| III | 34.0% (70/206) | 34.3% (59/172) | |
| Colon cancer, % (n/ntotal) | |||
| I | 38.0% (49/129) | 31.9% (44/138) | 0.451 |
| II | 26.4% (34/129) | 32.6% (45/138) | |
| III | 35.7% (46/129) | 35.5% (49/138) | |
| Rectal cancer, % (n/ntotal) | |||
| 0b | 5.2% (4/77) | 0.0% (0/34) | 0.468 |
| I | 40.3% (31/77) | 38.2% (13/34) | |
| II | 23.4% (18/77) | 32.4% (11/34) | |
| III | 31.2% (24/77) | 29.4% (10/34) | |
| Tumor type, % (n/ntotal) | |||
| Adenocarcinoma | 91.0% (187/211) | 88.1% (155/176) | 0.226 |
| Mucinous carcinoma | 8.1% (17/211) | 8.0% (14/176) | |
| Signet ring cell carcinoma | 0.5% (1/211) | 2.3% (4/176) | |
| Neuroendocrine carcinoma | 0.5% (1/211) | 0.0% (0/176) | |
| Undifferentiated carcinoma | 0.0% (0/211) | 0.6% (1/176) | |
| Medullary carcinoma | 0.0% (0/211) | 1.1% (2/176) | |
| R0 overall, % (n/ntotal) | 95.7% (202/211) | 97.7% (172/176) | 0.279 |
| R0 Colon procedures | 99.3% (133/134) | 98.6% (139/141) | 0.592 |
| R0 Rectal procedures | 89.6% (69/77) | 94.3% (33/35) | 0.421 |
| Positive distal or proximal resection margins | 0.0% (0/77) | 0.0% (0/35) | 1.000 |
| CRM ≤ 1 mm | 10.4% (8/77) | 5.7% (2/35) | 0.421 |
| Lymph nodes harvest (overall), mean ± SD (ntotal) | 16.24 ± 6.75 (n = 211) | 17.09 ± 6.83 (n = 176) | 0.226 |
| Positive lymph nodes | 1.28 ± 2.73 | 1.07 ± 2.08 | 0.415 |
| Colon procedure | 16.38 ± 5.87 (n = 134) | 17.54 ± 7.33 (n = 141) | 0.155 |
| Positive lymph nodes | 1.37 ± 2.92 | 1.05 ± 2.00 | 0.299 |
| Rectal procedure | 16.01 ± 8.04 (n = 77) | 15.26 ± 3.78 (n = 35) | 0.506 |
| Positive lymph nodes | 1.12 ± 2.38 | 1.15 ± 2.40 | 0.951 |
pTNM pathological tumor-node-metastases stage, R0 achievement of radical margins, CRM circumferential resection margin, RACRS robot-assisted colorectal surgery, LCRS laparoscopic colorectal surgery
a Pathological cancer stage as determined by a pathologist
b complete response after neoadjuvant therapy