In laboratory tests, researchers at Tel Aviv University and MIT have used gene therapy to prevent metastasis – the spread of breast cancer to other parts of the body. 80% of women with metastatic cancer die from the disease within five years of being diagnosed.

http://www.jpost.com/Business-and-Innovation/Health-and-Science/Are-Israeli-researchers-a-step-closer-to-halting-the-spread-of-breast-cancer-468144