Relationship between vascular invasion and microvessel density and micrometastasis

Table 3 Comparative data on vascular invasion

	n	VI(+)	VI(-)	χ2	P
CK20 mRNA
Positive	21	12	9	6.758	< 0.05
Negative	25	5	20
Age (yr)
< 50	14	4	10	0.607	> 0.05
≥ 50	32	13	19
Size (cm)
< 5	31	12	19	0.125	> 0.05
≥ 5	15	5	10
Differentiated
Well	11	2	9	2.351	> 0.05
Moderately	20	8	12
Poorly	15	7	8
Serosa invasion
Negative	14	2	12	4.440	< 0.05
Positive	32	15	17
Lymph node metastasis
Negative	18	3	15	5.225	< 0.05
Positive	28	14	14
Distant metastasis
Negative	38	9	29	16.520	< 0.05
Positive	8	8

Statistical analysis by chi-square test. VI: Vascular invasion.