Table 1. The patient characteristics.

Sex (male vs. female)	84 (52.5%) vs. 76 (47.5%)
Age (years) median(range)	67 (26–90)
Tumor size (cm) median(range)	4.7 (1.0–11.0)
Tumor location (colon vs. rectum)	86 (53.8%) vs. 74 (46.3%)
Preoperative CEA level (ng/ml) median(range)	3.5 (0.8–349.3)
Preoperative CA19-9 level (U/ml) median(range)	8.0 (1.0–1979)
Histology (low grade vs. high grade)	147 (91.9%) vs. 13 (8.1%)
Depth of tumor invasion (T1, 2, 3 vs. T4)	106 (66.3%) vs. 54 (33.8%)
Lymphatic vessel invasion (negative vs. positive)	38 (23.8%) vs. 122 (76.3%)
Venous invasion (negative vs. positive)	128 (80.6%) vs. 31 (19.4%)
Lymph node metastasis (negative vs. positive)	90 (56.3%) vs. 70 (43.8%)
Adjuvant chemotherapy (negative vs. positive)	56 (35.2%) vs. 103 (64.8%)
Mismatch repair status (proficient vs. deficient)	147 (94.2%) vs. 9 (5.8%).

CEA, carcinoembryonic antigen; CA19-9, carbohydrate antigen 19–9.