Physicists, Biologists Unite to Expose How Cancer Spreads

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http://www.sciencedaily.com/releases/2013/04/130426152558.htm

 Cancer cells that can break out of a tumor and invade other organs are more aggressive and nimble than nonmalignant cells, according to a new multi-institutional nationwide study. These cells exert greater force on their environment and can more easily maneuver small spaces.