Table 3.

Characteristics of tumor cell invasion into vessels

	Blood vessel invasion	Lymphatic vessel invasion
Number of patients positive	14	26
Total number of invasive events	23	79
Intratumoral invasive events	12	36
Peritumoral invasive events	11	43
Total number of cells	208	568
Cells per event (mean)	9.0	7.2
Cells per event (median)	2.0	1.0
Percent single-cell events	43.5	53.2