Scientists identify two molecules that enable cancer spread

[News]

For many types of cancer, the original tumor itself is usually not deadly. Instead, it's the spread of a tiny subpopulation of cells from the primary tumor to other parts of the body—the process known as metastasis—that all too often kills the patient.

More... (http://www.news-medical.net/news/20110408/Scientists-identify-two-molecules-that-enable-cancer-spread.aspx)