The process of cancer spreading across the body is known as metastasis.
癌症在身体中转移的过程称为metastasis。

As the cells proliferate, they spread via one of the three common routes of metastasis: transcoelomic, lymphatic, or hematogenous spread.
随着细胞的增殖，他们通过三种常见的方式扩散：种植性转移、淋巴腺和造血转移

Stephen Paget, an English surgeon, came up with the seed and soil theory of metastasis.
Stephen Paget是一位英国的外科医生，提出了转移的种子和土地理论

However, James Ewing, the first professor of pathology at Cornell University, challenged the seed and soil theory, and proposed that the site of metastasis was determined by the location of the vascular and lymphatic channels which drain the primary tumor.
但是，康奈尔大学的第一位病理学教授James Ewing向种子土地理论发起了挑战，他认为转移位点是由携带原发性肿瘤的血管和淋巴通道的位置决定的

现在比较火的治疗癌症的方法：免疫治疗法

有兴趣的同学可以通过“百度学术”搜索这篇英文文献深入了解肿瘤转移机制

Valastyan S, Weinberg R A. Tumor Metastasis: Molecular Insights and Evolving Paradigms[J]. Cell, 2011, 147(2): 275-292.