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在癌变理论中一般有遗传的和非遗传的两种观点,后者认为正常细胞转变为癌细胞时其基因组并没有发生不可逆的改变,而仅仅是有了基因表达调节的异常。持非遗传观点者因而把肿瘤看作是一类细胞分化的疾病,而恶性畸胎瘤便是一个典型的例子。小鼠畸胎瘤是一种由各种胚层组织组成的、生长缓慢的良性肿瘤,恶性畸胎瘤(又名畸胎癌)也有各种分化组织,但生长极快,主要由于存在着恶性繁殖的干细胞。这种恶性干细胞的形态结构、
In cancer theory there are generally two kinds of genetic and non-genetic perspectives, the latter that the normal cells into cancer cells when the genome has not irreversibly changed, but only with abnormal gene expression regulation. Non-genetic viewpoints therefore treat tumors as a type of cell differentiation disease, and malignant teratoma is a classic example. The mouse teratoma is a benign tumor that is composed of various germ layers and grows slowly. Malignant teratoma (also known as teratocarcinoma) also has various differentiated tissues, but its growth is very fast, mainly due to the existence of malignant reproduction Stem cells. The morphological structure of this malignant stem cell,