Now scientists are creating vaccines that aim to go further, teaching the immune system to intercept this type of brewing colon cancer before it turns into a full-fledged tumor. At least three potential Lynch syndrome vaccines are in development, including two in early clinical trials in the U.S. and a third beginning in Britain. Norton knew some of her mother’s relatives had also experienced colon cancer, but she was in her 40s before a gene test confirmed she has Lynch syndrome. Is Lynch syndrome tied to the rise in young adult colon cancer? Lynch syndrome affects about 1 in 279 people.