The tumor formation of distinct typed cells in nude mice.

“Tumor incidence” indicates the average incidence of tumors in each mice (4 mice in each group, 4/4 means 4 tumors in 4 injection sites). “Tumor diameter” refers to the average diameter of tumors in each group (−, no macroscopic tumor; +, 0.5 cm). “Metastasis incidence” means the average incidence of the liver neoplasia appeared in each group (4/4 means 4 liver neoplasias found in 4 mice). All results were independently viewed by three different researchers.a–dNSP-HCCs vs. SP-HCCs (the same number), P