Table IV.

Multivariate analysis.

Parameter	Risk ratio	95% CI	p-value
Tumor status
T1	1
T2–4	9.259	1.279–66.667	0.0275
Lymph node status
n0–1	1
n2–4	4.785	1.748–13.158	0.0023
Lymphatic invasion
Negative	1
Positive	0.369	0.038–3.559	0.3880
Vein invasion
Negative	1
Positive	2.037	0.718–5.780	0.1809
CD44v6 expression
Low	1
High	2.793	1.104–7.066	0.0301

CI, confidence interval.