Table 1.
Clinical and pathological features of abdominoperineal excision and non- abdominoperineal excision groups n (%)
| Variates | Non-APE (n =178) | APE (n = 78) | P value | |
| Gender | ||||
| Male | 92 (51.7) | 53 (67.9) | 0.016 | |
| Female | 86 (48.3) | 25 (32.1) | ||
| Age (yr) | ||||
| < 65 | 119 (66.9) | 56 (71.8) | 0.434 | |
| ≥ 65 | 59 (33.1) | 22 (28.2) | ||
| Level of tumor | ||||
| ≤ 5 cm | 82 (46.1) | 72 (92.3) | 0.000 | |
| > 5 cm | 96 (53.9) | 6 (7.7) | ||
| BMI (kg/m2) | ||||
| ≤ 23.5 | 97 (54.5) | 28 (35.9) | 0.006 | |
| > 23.5 | 81 (45.5) | 50 (64.1) | ||
| Pre-operative CEA1 | ||||
| ≤ 5 ng/mL | 97 (63.0) | 41 (66.1) | 0.664 | |
| > 5 ng/mL | 57 (37.0) | 21 (33.9) | ||
| Differentiation | ||||
| ypCR | 12 (6.7) | 6 (7.7) | 0.651 | |
| G1-2 | 120 (67.4) | 56 (71.8) | ||
| G3-4 | 46 (25.8) | 16 (20.5) | ||
| TRG | ||||
| Complete regression | 12 (6.7) | 6 (7.7) | 0.402 | |
| Major regression | 27 (15.2) | 7 (9.0) | ||
| Minor regression | 139 (78.1) | 65 (83.3) | ||
| ypT | ||||
| T0 | 12 (6.7) | 6 (7.7) | 0.511 | |
| T1 | 11 (6.2) | 5 (6.4) | ||
| T2 | 56 (31.5) | 29 (37.2) | ||
| T3 | 98 (551) | 36 (46.2) | ||
| T4 | 1 (0.6) | 2 (2.6) | ||
| ypN | ||||
| N0 | 114 (64.0) | 45 (57.7) | 0.209 | |
| N1/N1c | 37 (20.8) | 24 (30.8) | ||
| N2a/b | 27 (15.2) | 9 (11.5) | ||
| ypTNM stage | ||||
| ypCR | 12 (6.7) | 4 (5.1) | 0.642 | |
| I | 57 (32.0) | 26 (33.3) | ||
| II | 45 (25.3) | 15 (19.2) | ||
| III | 64 (36.0) | 33 (42.3) |
1
Pre-treatment CEA assessment was unavailable in 40 cases. APE: Abdominoperineal excision. CEA: Carcino-embryonic antigen.