Abraham Vidaurre, 12, checks his arm after receiving an HPV shot in Corpus Christi, Texas. The vaccine is recommended for 11- and 12-year-old boys and girls.
Matthew Busch/The Washington Post/Getty Images
Dr. George Papanicolaou discovered that it was possible to detect cancer by inspecting cervical cells. The Pap smear, the cervical cancer screening test, is named after him.
American Cancer Society/AP
Dr. Donald Brown inoculated Kelly Kent with the HPV vaccine in his Chicago office in the summer of 2006 — not long after the first version of the vaccine reached the market.
Charles Rex Arbogast/AP