Testing underway on vaccines to intercept brewing colon cancer before it takes rootHOUSTON, Texas -- Dr. Stacy Norton was only 7 years old when her mother died of colon cancer, one of several family members struck by aggressive tumors at unusually young ages. 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?