Molecules identified that help propel cancer metastasis

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. Now, researchers have identified two molecules that enable cancer to spread inside the body. These findings could eventually lead to therapies that prevent metastasis by inactivating the molecules.

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