 The American Cancer Society has new research that shows about half of cancer diagnoses and deaths could be prevented with lifestyle changes. CBS News chief medical correspondent Dr. John LaPook tells us getting a vaccine could help. So we all know about human papillomavirus. That's HPV and it can lead to cancer of the cervix in women and throat and tongue in men. Well, there's a vaccine that can actually prevent HPV infection. But less than 40% of eligible children receive at least one dose.