A new vaccine may prevent people from developing colon cancer. Scientists at the University of Pittsburgh have already administered the shot to a dozen patients, and plan on inoculating another 50 study participants with the vaccine, which is still considered experimental. It seems to work by stimulating an immune response that fights the MUC1 protein found in precancerous growths, known as adenomas. That, in effect, would help the body attack abnormal cells, which would otherwise lead to colon cancer. If the vaccine works, it will also mean that at-risk patients won¹t have to rely on as many frequent and uncomfortable colonscopy tests.