A Functional Polymorphism in the Promoter Region of Interleukin-12B Increases the Risk of Colorectal Cancer

Table 1

Clinical characteristics of study population.

Variable	Cases (n = 329)	Controls (n = 342)
Age, years (mean ± SD)	61.6 ± 10.2	60.8 ± 9.4	0.381
Gender
Male	191 (58.1)	185 (54.1)
Female	138 (41.9)	157 (45.9)	0.301
Differentiation
Good + moderate	260 (79.0)
Poor	69 (21.0)
Clinical stage
I-II	205 (62.3)
III-IV	124 (37.7)
Lymph node metastasis
Yes	112 (34.0)
No	217 (66.0)
Tumor location
Left-sided colon	227 (69.0)
Right-sided colon	102 (31.0)