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人患癌症时往往伴有免疫机能低下,但是很难判断这种免疫机能低下是在肿瘤发生之前或以后才发生的。在前者,癌肿来源于免疫机能低下,而后者,是新生物繁殖的后果。单独免疫机能低下,并不是导致肿瘤生成的绝对因素,必有其它因素参与,如肿瘤细胞组织的和免疫的特性。因此,癌肿的发生与“宿主一肿瘤”之间关系是密切联系的,这种相联关系的不平衡将导致癌的发生和发展。这些相联系的因素如:
People who suffer from cancer are often accompanied by low immune function, but it is difficult to judge whether this low immune function occurs before or after the onset of cancer. In the former, cancer arises from a weakened immune system, and the latter is the consequence of the reproduction of new organisms. The low level of immune function alone is not an absolute factor that causes tumorigenesis. There must be other factors involved, such as the characteristics of tumor tissue and immunity. Therefore, the relationship between the occurrence of cancer and the “host-tumor” is closely linked. The imbalance of this relationship will lead to the occurrence and development of cancer. These linked factors such as: