Table 3 Pathological assessment of patients
Characteristics | GPB group (63) | NGPB group (126) | p |
|---|---|---|---|
No. with circumferential margin positivity | 1 (1.6%) | 4 (3.2%) | 0.873 |
No. with negative margin (≥ 1 mm) | 61 (96.8%) | 119 (94.4%) | 0.717 |
R0 ressection rate | 60 (95.2%) | 115 (91.3%) | 0.492 |
Distal ressection margin,cm,mean ± SD | 2.74 ± 0.76 | 2.16 + 0.68 |  < 0.001 |
 Low rectum (< 5 cm) | 1.78 ± 0.67 | 1.23 ± 0.59 |  < 0.001 |
 Middle rectum (5.1–10 cm) | 3.03 ± 0.83 | 2.97 ± 0.77 | 0.641 |
Total mesorectal excision | Â | Â | 0.022 |
 Complete | 55 (87.3%) | 88 (69.8%) |  |
 Nearly complete | 6 (9.5%) | 21 (16.7%) |  |
 Incomplete | 2 (3.2%) | 17 (13.5%) |  |
Degree of histological differentiation | Â | Â | 0.931 |
 Well | 6 (9.5%) | 10 (7.9%) |  |
 Moderate | 46 (73.0%) | 93 (73.8%) |  |
 Poor + Undifferentiated | 11 (17.5%) | 23 (18.3%) |  |
Pathological tumor stage | Â | Â | 0.730 |
 pT1 | 6 (9.5%) | 8 (6.3%) |  |
 pT2 | 12 (19.0%) | 24 (19.0%) |  |
 pT3 | 45 (71.5%) | 94 (74.7%) |  |
Pathological nodal status | Â | Â | 0.019 |
 pN0 | 30 (47.6%) | 75 (59.5%) |  |
 pN1 | 19 (30.2%) | 41 (32.5%) |  |
 pN2 | 14 (22.2%) | 10 (8.0%) |  |
Stage | Â | Â | 0.294 |
 I | 11 (17.5%) | 26 (20.6%) |  |
 II | 19 (30.2%) | 49 (38.9%) |  |
 III | 33 (52.3%) | 51 (40.5%) |  |
Tumor size, cm, mean ± SD | 3.65 ± 1.64 | 3.47 ± 1.68 | 0.494 |
No. with lymphovascular invasion | 1 (1.6%) | 2 (1.6%) | 1.000 |
Total length of cartridges, cm, mean ± SD | 6.88 ± 1.27 | 7.28 ± 1.25 | 0.040 |
No. of lymph nodes examined, median (range) | 19 (17,22) | 17 (14,20) |  < 0.001 |
 No. of positive lymph nodes, median (range) | 1 (0,3) | 0 (0,2) | 0.046 |