Table 2.
Type of liver resection and pathologic characteristics
| Characteristic | PTBD (n = 88) | EBD only (n = 157) | P |
|---|---|---|---|
| Preoperative cytology assessment, n (%) | 0.40 | ||
| Positive or suspicious | 49 (55.7) | 93 (59.2) | |
| Negative | 18 (20.4) | 39 (24.8) | |
| Not performed | 21 (23.9) | 25 (15.9) | |
| Type of liver resection, n (%) | 0.003 | ||
| Extrahepatic bile duct resection only | 10 (11.4) | 38 (24.2) | |
| Segment 4/5 wedge resection | 3 (3.4) | 17 (10.8) | |
| Mesohepatectomy | 2 (2.3) | 0 (0) | |
| Left hemihepatectomy | 22 (25.0) | 34 (21.7) | |
| Left extended hemihepatectomy | 8 (9.1) | 12 (7.6) | |
| Right hemihepatectomy | 5 (5.7) | 17 (10.8) | |
| Right extended hemihepatectomy | 38 (43.2) | 39 (24.8) | |
| Resection including caudate lobea | 46 (61.3) | 63 (61.8) | 0.08 |
| Resection specimen, n (%) | |||
| T3 or T4 tumor (AJCC 7th edition) | 34 (38.6) | 31 (19.7) | 0.002 |
| R1 resection | 21 (23.9) | 49 (31.2) | 0.24 |
| Moderate/poor differentiation | 22 (25.0) | 33 (21.0) | 0.52 |
| Perineural invasion | 70 (79.5) | 108 (68.8) | 0.08 |
| Resected lymph nodes | |||
| Total lymph node count, median (range) | 3 (1–22) | 4 (1–20) | 0.15 |
| N1 lymph node metastasis, n (%) | 30 (34.1) | 35 (22.3) | 0.05 |
| Mean lymph node ratio (positive/negative) | 0.14 (1/7) | 0.09 (1/11) | 0.03 |
PTBD percutaneous transhepatic biliary drainage, EBD endoscopic biliary drainage, AJCC American Joint Committee on Cancer
a Percentage of caudate resections only concerns patients who underwent meso- or hemihepatectomy