There isn't a single drug currently on the market that addresses how cancer cells break loose from a primary tumor and get into the vascular system, migrate out, and form a secondarytumor.
麻省理工学院生物与机械工程学塞西尔与艾达·格林（Cecil and Ida Green）杰出教授卡姆说，“市场上没有一种药能说明癌细胞如何挣脱原来的瘤、进入血管系统、迁出并形成继发瘤。
2
The primary clivus tumor demonstrated expansive growth, while the secondarytumor displayed invasive extension.
原发性肿瘤呈膨胀性生长，继发肿瘤多呈浸润性改变。
3
In a process called metastasis, these cells are transmitted from the primary tumor to other locations in the body, where they form secondary, cancerous growths.