Table 1. Relationship between CA IX expression and clinico-pathological features.

Variables	Total	1–25%	26–50%	51–75%	76–100%	P-valuea
Age tertile						NSb
<61	20	6	5	6	3
61.1–71.9	22	7	8	3	4
⩾72	30	3	14	10	3
Type						NS
Nonmucinous	66	15	23	18	10
Mucinous	6	1	4	1
Site						NS
Left colon	3		1	1	1
Caecum	17	4	8	5
Right colon	4	1	1	1	1
Transverse, splenic	3		1		2
Rectum	24	5	8	8	3
Rectum-sigmoid	8	2	3	1	2
Sigmoid	13	4	5	3	1
Size median						NS
<Median	28	5	11	10	2
⩾Median	44	11	16	9	8
Dukes' stage						<0.01
A	18	10	3	4	1
B	32	6	21	4	1
C	22		3	11	8
Differentiation						0.01
Moderate	4	1	1	1	1
Well	62	14	25	18	5
Poor	6	1	1	3	1
Metastasis						0.01
Primary	72	16	27	19	10
Secondary	13	2	5	4	2
Lymphatic metastasis						0.01
At DXc	24	1	4	11	8
During FUd	2	1	1
No metastasis	46	14	22	8	2
Vascular metastasis						0.05
<Median	37	6	16	9	6
⩾Median	35	10	11	10	4
Lymph node metastasis						0.02
No	43	14	20	8	1
Yes	29	2	7	11	9
Death						0.03
No	28	10	9	6	3
Yes	44	6	18	13	7
Recurrence						0.02
Yes	25	1	9	9	6
No	42	14	17	8	3
NA	5	1	1	2	1
Gender						NS
Male	42	9	13	13	7
Female	30	7	14	6	3

^aP-value by multivariate regression analysis.

^bNot significant.

^cAt Dukes' C.

^dNodal recurrence.