Table 1.

Relationship between lymphatic metastasis and invasive rate

Circumference	n	Lymphatic metastasis (-)	Lymphatic metastasis (+)	Positive rate (%)
1/2	90	66	24	26.7%
1/2	121	56	65	53.7%a

^aP < 0.01, vs ≤ 1/2 circumference.