目前,诱发恶性瘤的方法虽多,但对其发生机制,即使是片断过程也缺乏了解。不但如此,在广泛诱瘤方法中,能否将某几种归纳为一类,也少有报告。特别是片状异物在动物皮下或腹内埋藏可诱发肿瘤,以及体外培养正常纤稚组织细胞可发生恶变并可移植至动物体内形成肉瘤等事实,尤令人难解。 At present, although there are many methods for inducing malignant tumors, there is a lack of understanding of the mechanism of occurrence, even the fragmentation process. Not only that, but also in the extensive method of tumor induction, whether or not several types can be grouped into one and rarely reported. In particular, the fact that lamellar foreign bodies are immersed subcutaneously or intra-abdominally in animals can induce tumors, as well as the fact that in vitro culture of normal fibrillary juvenile tissue cells can be malignant and can be transplanted into animals to form sarcomas, which is particularly difficult to understand.