Iruela-Arispe said signaling inside the cell is different from that initiated outside the cell. She said it is not clear whether drugs such as Avastin are dangerous in this way.

• 易努拉-阿瑞斯说，细胞内启动的信号不同于细胞外启动的信号。她表示，用这种方法还不能确定阿瓦斯丁是否存在风险。