Table 1. Clinical and pathological data of participants.
| Characteristics | LN– (n=47) | LN+ (n=23) | P value |
|---|---|---|---|
| Age (years), mean ± SD | 58.53±9.28 | 56.26±10.07 | 0.527 |
| Gender, n (%) | 0.900 | ||
| Male | 32 (68.1) | 16 (69.6) | |
| Female | 15 (31.9) | 7 (30.4) | |
| CEA level (ng/mL), n (%) | 0.035* | ||
| <5 | 42 (89.4) | 15 (65.2) | |
| ≥5 | 5 (10.6) | 8 (34.8) | |
| CA199 level (U/mL), n (%) | 0.035* | ||
| <37 | 45 (95.7) | 18 (78.3) | |
| ≥37 | 2 (4.3) | 5 (21.7) | |
| Type of surgical, n (%) | 0.076 | ||
| APR | 18 (38.3) | 3 (13.0) | |
| LAR or AR | 26 (55.3) | 19 (82.6) | |
| Hartman’s resection | 2 (4.3) | 1 (4.3) | |
| Others | 1 (2.1) | 0 (0.0) | |
| Histologic grade, n (%) | 0.443 | ||
| Well or moderate | 31 (66.0) | 13 (56.5) | |
| Poor | 16 (34.0) | 10 (43.5) | |
| pT stage, n (%) | <0.001* | ||
| 1/2 | 30 (63.8) | 2 (8.7) | |
| 3/4 | 17 (36.2) | 21 (91.3) | |
| pEMVI, n (%) | 0.003* | ||
| Absent | 40 (85.1) | 12 (52.2) | |
| Present | 7 (14.9) | 11 (47.8) |
*, P<0.05. LN–, pathological N0 stage; LN+, pathological N1–N2 stage; SD, standard deviation; CEA, carcinoembryonic antigen; CA199, carbohydrate antigen 199; APR, abdominoperineal resection; LAR, low anterior resection; AR, anterior resection; pEMVI, pathological extramural venous invasion; LN, lymph node.