Table 1 Baseline characteristics of 1095 colorectal cancer patients by tumor location

Age (years, mean ± SD)

64.94 ± 13.49

63.82 ± 12.85

0.233

Gender

0.118

 Female

119 (47.8)

357 (42.2)

 Male

130 (52.2)

489 (57.8)

Tumor size

0.003*

  < 5 cm

121 (48.8)

495 (59.4)

  ≥ 5 cm

127 (51.2)

339 (40.6)

Histology

<0.001*

 Well

20 (8.2)

51 (6.2)

 Moderately

181 (74.5)

704 (85.7)

 Poorly

42 (17.3)

66 (8.0)

AJCC Stage^a (Initial diagnosis)

0.016*

 I

28 (11.2)

164 (19.4)

 II

101 (40.6)

286 (33.8)

 III

80 (32.1)

251 (29.7)

 IV

40 (16.1)

145 (17.1)

Tumor depth

0.017*

 T1

12 (4.8)

59 (7.0)

 T2

24 (9.7)

139 (16.5)

 T3

199 (80.3)

591 (70.4)

 T4

13 (5.2)

51 (6.1)

Lymph Node metastasis

0.677

 N0

142 (57.3)

491 (58.7)

 N1

62 (25.0)

217 (25.9)

 N2

44 (17.7)

129 (15.4)

Lymph Node metastasis

0.694

 No

142 (57.3)

491 (58.7)

 Yes

106 (42.7)

346 (41.3)

Vascular invasion

0.529

 No

163 (66.5)

561 (68.7)

 Yes

82 (33.5)

256 (31.3)

Perineural invasion

0.833

 No

157 (63.8)

516 (63.1)

 Yes

89 (36.2)

302 (36.9)

Pre-op serum CEA^b level

0.496

  < 5 ng/ml

121 (51.5)

424 (54.0)

  ≥ 5 ng/ml

114 (48.5)

361 (46.0)

Post-op serum CEA^b level

0.023*

  < 5 ng/ml

158 (68.1)

594 (75.6)

  ≥ 5 ng/ml

74 (31.9)

192 (24.4)

Pre-op serum Albumin level (g/dl)

3.56 ± 0.44

3.63 ± 0.45

0.062

Diabetes mellitus

0.731

 Yes

60 (24.1)

195 (23.0)

 No

189 (75.9)

651 (77.0)

Chemotherapy

0.427

 Yes

161 (64.9)

570 (67.6)

 No

87 (35.1)

273 (32.4)

Cardiac disease

0.764

 Yes

103 (41.4)

359 (42.4)

 No

146 (58.6)

487 (57.6)

Renal disease

0.690

 Yes

13 (5.2)

39 (4.6)

 No

236 (94.8)

807 (95.4)

BMI^c

23.53 ± 4.25

23.63 ± 3.62

0.758