Keven injected older and younger mice with an experimental vaccine before also injecting them with aggressive colon cancer cells. One hundred percent of the younger mice developed immunity to the cancer while the older mice did not, leading Keven to conclude that older people with colon cancer might need separate treatment to successfully combat the disease. His research was published in the Journal for ImmunoTherapy of Cancer, and he was a finalist in the 2013 Intel International Science and Engineering Fair.