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血管生成(ansiogenesis)是指源于已经存在的毛细血管和毛细血管后微静脉的新生毛细血管生成。新生毛细血管由两类细胞组成:内皮细胞和周边细胞,二者产生完整的毛细血管网。一般情况下血管生成并不发生,而是常常发生在病理状态下,如实体瘤、糖尿病、视网膜血管病变及慢性炎症。无血管的浸润前期的实体肿瘤通过弥散方式获取营养,当肿瘤增大到2mm以上、肿瘤细胞数超过10~7时,弥散
Ansiogenesis refers to the angiogenesis that arises from already existing capillaries and capillaries behind the venules. The new capillaries are composed of two types of cells: endothelial cells and peripheral cells, both of which produce a complete capillary network. In general, angiogenesis does not occur, but often occurs in pathological conditions such as solid tumors, diabetes, retinal vascular disease, and chronic inflammation. The solid tumors in the early stage of avascular infiltration acquire nutrition through the diffusion method. When the tumors increase to more than 2mm, and the tumor cells exceed 10~7, the dispersion occurs.