And once those vessels invade the cancer, it can expand, it can invade local tissues, and the same vessels that are feeding tumors allow cancer cells to exit into the circulation as metastases.
一旦这些血管张入肿瘤， 肿瘤就能扩展，能入侵附近组织。 同时，这些饲养肿瘤的血管 为癌细胞转移，为它们进入血液循环 提供了途径。