Table 1.

Comparison of Tumorigenic Capacity of Sphere-forming and Normal Cultured Huh7 Cells

		No. of Mice with Tumor Formation/Total No. of Mice with Cell Injection
Phonotypes	No. of cells injected	2 Weeks	4 Weeks	6 Weeks
Sphere-forming cells	5 × 102	2/6	4/6	4/6
	1 × 103	4/6	6/6	6/6
Normal cultured cells	1 × 104	0/6	0/6	0/6
	1 × 105	0/6	0/6	0/6