Prognostic and survival analysis of 837 Chinese colorectal cancer patients

Table 1 Basic data for patients with colorectal cancer n (%)

Basic data	Colon cancer (n = 437)	Rectal cancer (n = 394)
Sex
Male	245 (56.1)	245 (62.2)
Female	192 (43.9)	149 (37.8)
Age at operation1 (yr)	60.9 ± 13.1	58.3 ± 12.7
Dukes’ staging
A	38 (8.7)	81 (20.6)
B	181 (41.4)	117 (29.7)
C	166 (38.0)	172 (43.7)
D	49 (11.2)	23 (5.8)
Status of resection
Curative	356 (81.5)	349 (88.6)
Palliative	62 (14.2)	33 (8.4)
Undefined	19 (4.3)	12 (3.0)
Tumor size
≥ 5 cm	154 (35.2)	64 (16.2)
< 5 cm	247 (56.5)	263 (66.8)
Undefined	36 (8.2)	67 (17.1)
Histological differentiation grade
Well	93 (21.3)	118 (29.9)
Moderate	184 (42.1)	180 (45.7)
Poor	108 (24.7)	61 (15.5)
Undefined	52 (11.9)	35 (8.9)
Lymphovascular invasion
Positive	14 (3.2)	10 (2.5)
Negative	423 (96.8)	384 (97.5)
Perineural invasion
Positive	11 (2.5)	3 (0.8)
Negative	423 (96.8)	391 (99.2)
Invasion of adjacent organs
Positive	37 (8.5)	15 (3.8)
Negative	396 (90.6)	379 (96.2)
Undefined	4 (0.9)	0 (0.0)

¹Data are expressed as mean ± SD. Six cases of double primary colon and rectal cancer were not included.