Relationship between postoperative tumor recurrence time and long-term survival in colorectal cancer patients

Table 2 Comparison of tumor pathological characteristics between groups, n (%)

Pathological characteristics	Early recurrence group (n = 63)	Late recurrence group (n = 57)	Statistical value	P value
Tumor size (cm, mean ± SD)	4.8 ± 1.6	4.5 ± 1.4	t = 1.125	0.263
Tumor invasion depth			χ² = 2.847	0.092
T1-T2	8 (12.7)	13 (22.8)
T3-T4	55 (87.3)	44 (77.2)
TNM staging			χ² = 4.082	0.043
Stage II	15 (23.8)	23 (40.4)
Stage III	48 (76.2)	34 (59.6)
Lymph nodes dissected (n, mean ± SD)	16.3 ± 5.8	17.2 ± 6.1	t = 0.834	0.406
Positive lymph nodes (n, mean ± SD)	3.2 ± 2.7	2.4 ± 2.3	t = 1.724	0.087
Histological differentiation			χ² = 6.253	0.012
Well-moderate	42 (66.7)	49 (86.0)
Poor	21 (33.3)	8 (14.0)
Vascular invasion			χ² = 7.476	0.006
Negative	30 (47.6)	41 (71.9)
Positive	33 (52.4)	16 (28.1)
Neural invasion			χ² = 5.192	0.023
Negative	39 (61.9)	46 (80.7)
Positive	24 (38.1)	11 (19.3)
Pre-operative CEA level			χ² = 3.863	0.049
< 5 ng/mL	18 (28.6)	26 (45.6)
≥ 5 ng/mL	45 (71.4)	31 (54.4)
Pre-operative CA19-9 level			χ² = 2.156	0.142
< 37 U/mL	41 (65.1)	43 (75.4)
≥ 37 U/mL	22 (34.9)	14 (24.6)

CEA: Carcinoembryonic antigen; CA19-9: Carbohydrate antigen 19-9.