肿瘤发生的复杂性恶性肿瘤的形成是一个多步骤演进过程，机体内外的多因素相互作用，如：环境毒素的作用，机体对肿瘤的易感性等诸多因素，在肿瘤发生过程中均起着不可忽视的作用。以食管癌为例，其发生不仅病因复杂，而且过程较长。迄今为止，人们发现在我国食管癌高发区... Complexity of tumor formation The formation of malignant tumors is a multi-step evolution process. Many factors, such as the effects of environmental toxins and the susceptibility of the body to tumors, are involved in the process of tumorigenesis. The role of neglect. Taking esophageal cancer as an example, its occurrence is not only complicated but also has a long process. So far, people have found high incidence of esophageal cancer in our country...