细胞自动地增殖,失去其分化作用并不能形成组织。哪种细胞混乱能解释这些异常呢?一些实验研究表明,一方面环境因素(病毒、化学产物)可引起癌症,另方面在机体的防御能力降低时便不能消除异常细胞,在人几乎没有病毒可以直接诱发癌症,而且大多数患者没有明显的免疫缺损。然而最近的研究已能说明癌的整个发展过程,这些研究也越来越一致。细胞的缺陷一组特殊的酶——甲状腺素激酶,在某些类型癌细胞中的活性大大增加。这些酶作用于细胞支架,尤其是在连结支架和膜的点上,作用于细胞间桥中含有的结构。另方面,甲状腺激酶常与细胞生长因素有关。活性增加同时引起 Cells automatically proliferate, losing their differentiation and fail to form tissue. Which kind of cell disorder can explain these abnormalities? Some experimental studies have shown that on the one hand, environmental factors (viruses, chemical products) can cause cancer, and on the other hand, when the body’s defense capacity is reduced, abnormal cells cannot be eliminated, and almost no virus can be found in humans. Cancer is directly induced, and most patients do not have obvious immunodeficiency. However, recent studies have been able to explain the entire development of cancer, and these studies are increasingly consistent. Defects in Cells A special group of enzymes, thyroxine kinases, have increased activity in certain types of cancer cells. These enzymes act on cellular scaffolds, especially at the point where the scaffolds and membranes are attached, and act on the structures contained in the bridge between cells. On the other hand, thyroid kinase is often associated with cell growth factors. Increased activity at the same time