Dr. Nora Disis, director of UW Medicine's Cancer Vaccine Institute, said her lab came at the problem by treating cancer, as they did a flu vaccine. 

“These are mice that were genetically engineered to develop breast cancer,” she said. “And it’s really hard to prevent them from developing breast cancer because they have a gene that makes them get it. When we vaccinated the mice against these proteins, we were able to prevent the development of breast cancer in about 50 percent (of mice)."