研究者们通过在胶质母细胞瘤上的一系列实验归纳出了肿瘤细胞和血管细胞的联系。其中，胶质母细胞瘤是一种生长很快的脑部肿瘤，伴随有簇生的薄而异常的血管。
The researchers drew the link between tumor cells and blood vessel cells with a series of experiments on glioblastomas-fast-growing brain tumors that contain tufts of thin, abnormal blood vessels.
美国国家眼科研究所的研究者认为，该病变在某些情况下可表现为新生及异常血管的增生，而在另一些情况下亦可表现为原有的血管发生肿胀及渗出。
In some cases, new and abnormal blood vessels grow, and in other cases, existing blood vessels swell and leak, according to the U.S. National Eye Institute.
此前研究指出异常的血管生长使得发育中的胎盘缺氧，但研究者对引发其变化的原因找不到丝毫线索。
Previous studies pointed to abnormal blood vessel growth that starves a developing placenta of oxygen, but researchers had little clue what set off those changes.
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