Table 1.
Comparison of clinicopathological features according to CRM status before PSM.
| Negative CRM (n=5160) | Positive CRM (n=108) | P value | |
|---|---|---|---|
| Age (years) | 0.512 | ||
| <60 | 2416 (46.8) | 54 (50.0) | |
| ≥60 | 2744 (53.2) | 54 (50.0) | |
| Sex | 0.477 | ||
| Male | 2977 (57.7) | 66 (61.1) | |
| Female | 2183 (42.3) | 42 (38.9) | |
| Years | 0.564 | ||
| 2008-2013 | 2722 (52.8) | 60 (55.6) | |
| 2014-2018 | 2438 (47.2) | 48 (44.4) | |
| Location | 0.024 | ||
| Left side | 2378 (46.1) | 38 (35.2) | |
| Right side | 2782 (53.9) | 70 (64.8) | |
| Surgical procedures | 0.603 | ||
| Laparoscopic | 711 (13.8) | 13 (12.0) | |
| Open | 4449 (86.2) | 95 (88.0) | |
| Neoadjuvant therapy | 0.085 | ||
| No | 210 (4.1) | 8 (7.4) | |
| Yes | 4950 (95.9) | 100 (92.6) | |
| Histologic type | <0.001 | ||
| Adenocarcinoma | 4293 (83.2) | 73 (67.6) | |
| Mucinous | 748 (14.5) | 26 (24.1) | |
| Signet ring cell | 94 (1.8) | 9 (8.3) | |
| Unknown | 25 (0.5) | 0 (0.0) | |
| Differentiation | <0.001 | ||
| Poor | 1342 (26.0) | 56 (51.9) | |
| Moderate | 3468 (67.2) | 44 (40.7) | |
| Well | 107 (2.1) | 1 (0.9) | |
| Unknown | 243 (4.7) | 7 (6.5) | |
| T stage | <0.001 | ||
| Tx, 0-2 | 894 (17.3) | 1 (0.9) | |
| T3 | 1525 (29.6) | 29 (26.9) | |
| T4 | 2741 (53.1) | 78 (72.2) | |
| N stage | <0.001 | ||
| N0 | 2695 (52.2) | 14 (13.0) | |
| N1 | 1581 (30.6) | 38 (35.2) | |
| N2 | 884 (17.1) | 56 (51.9) | |
| M stage | <0.001 | ||
| 0 | 4319 (83.7) | 57 (52.8) | |
| 1 | 841 (16.3) | 51 (47.2) | |
| AJCC stage | <0.001 | ||
| 0-I | 598 (11.6) | 0 (0.0) | |
| II | 1807 (35.0) | 12 (11.1) | |
| III | 1813 (35.1) | 45 (41.7) | |
| IV | 841 (16.3) | 51 (47.2) | |
| Unknown | 101 (2.0) | 0 (0.0) | |
| Perineural invasion | <0.001 | ||
| Negative | 3980 (77.1) | 57 (52.8) | |
| Positive | 1180 (22.9) | 51 (47.2) | |
| Vascular invasion | <0.001 | ||
| Negative | 3781 (73.3) | 46 (42.6) | |
| Positive | 1379 (26.7) | 62 (57.4) |
CRM, circumferential resection margin; PSM, propensity score matching.