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One reason cancer is so difficult to treat is that it avoids detection by the body. Agents of the immune system are constantly checking the surfaces of cells for chemical signals that say they belong, but cancer cells express the same chemical signals as healthy ones. Without a way for the immune system to tell the difference, little stands in the way of cancer taking over. Now, researchers at the University of Pennsylvania School of Engineering and Applied Science and Penn's Perelman School of Medicine and Physical Sciences Oncology Center have learned how to re-engineer macrophages, the "first responders" of the immune system, so that they can distinguish between healthy and cancerous cells.

See original article at: https://www.sciencedaily.com/releases/2017/07/170719173705.htm