Variables | Original cohort | Matched cohort | ||||
---|---|---|---|---|---|---|
LPNM (n = 29) | Non-LPNM (n = 112) | P | LPNM (n = 29) | Non-LPNM (n = 29) | P | |
Age (years, mean ± SD) | 57.5 ± 11.7 | 56.2 ± 10.4 | 0.551 | 57.5 ± 11.7 | 58.6 ± 10.1 | 0.632 |
Gender | 0.462 | 0.594 | ||||
Male | 18 (62.1) | 61 (54.5) | 18 (62.1) | 16 (55.2) | ||
Female | 11 (37.9) | 51 (45.5) | 11 (37.9) | 13 (44.8) | ||
BMI (kg/m2, mean ± SD) | 24.3 ± 3.0 | 25.0 ± 3.2 | 0.295 | 24.3 ± 3.0 | 24.5 ± 2.5 | 0.930 |
CEA level (ng/mL, mean ± SD) | 15.0 ± 32.0 | 8.4 ± 15.1 | 0.124 | 15.0 ± 32.0 | 12.9 ± 22.5 | 0.811 |
CA19-9 level (ng/mL, mean ± SD) | 47.9 ± 101.8 | 19.0 ± 17.3 | 0.169 | 47.9 ± 101.8 | 35.2 ± 41.4 | 0.373 |
ASA category | 0.580 | 1.000 | ||||
I-II | 26 (89.7) | 106 (94.6) | 26 (89.7) | 27 (93.1) | ||
III-IV | 3 (10.3) | 6 (5.4) | 3 (10.3) | 2 (6.9) | ||
Preoperative treatment | 16 (55.2) | 58 (51.8) | 0.745 | 16 (55.2) | 17 (58.6) | 0.791 |
Distant metastasis | 4 (13.8) | 8 (7.2) | 0.441 | 4 (13.8) | 4 (13.8) | 1.000 |
Surgical approach | 0.651 | 1.000 | ||||
Open | 1 (3.4) | 9 (8.0) | 1 (3.4) | 2 (6.9) | ||
Laparoscopic | 28 (96.6) | 103 (92.0) | 28 (96.6) | 27 (93.1) | ||
Histology | 0.047 | 0.588 | ||||
Moderate | 16 (55.2) | 83 (74.1) | 17 (58.6) | 19 (65.5) | ||
Poor/Mucinous/signet | 13 (44.8) | 29 (25.9) | 12 (41.4) | 10 (34.5) | ||
pT stage | 0.012 | 0.666 | ||||
T1-T2 | 2 (6.9) | 33 (29.5) | 2 (6.9) | 4 (13.8) | ||
T3-T4 | 27 (93.1) | 79 (70.5) | 27 (93.1) | 25 (86.2) | ||
pN stage | < 0.001 | 0.636 | ||||
N0 | 3 (10.3) | 56 (50.0) | 3 (10.3) | 5 (17.3) | ||
N1 | 12 (41.4) | 33 (29.5) | 12 (41.4) | 13 (44.8) | ||
N2 | 14 (48.3) | 23 (20.5) | 14 (48.3) | 11 (37.9) | ||
Perineural invasion | 14 (48.3) | 41 (36.6) | 0.251 | 14 (48.3) | 12 (41.4) | 0.597 |
Lymphatic invasion | 13 (44.8) | 28 (25.0) | 0.036 | 13 (44.8) | 11 (37.9) | 0.594 |
Vascular invasion | 13 (44.8) | 33 (29.5) | 0.116 | 13 (44.8) | 10 (34.5) | 0.421 |
Mesorectal lymph nodes harvested | 15.6 ± 8.2 | 18.7 ± 10.2 | 0.137 | 15.6 ± 8.2 | 17.3 ± 9.6 | 0.691 |
LPLNs harvested | 9.3 ± 5.5 | 9.9 ± 6.1 | 0.773 | 9.3 ± 5.5 | 10.9 ± 6.4 | 0.573 |