Dr.Okarma said Geron had done numerous studies showing that its cells did not contain residual embryonic cells and did not form tumors in animals even after a year.

• Okarma说，Geron公司进行了大量研究，研究表明其治疗所用细胞未残留胚胎干细胞，并且治疗后1年，接受治疗的动物也未形成肿瘤。