How does HPV vaccination contribute to cancer prevention, and what cancers does it prevent?

• A. By boosting innate immunity and not affecting cancer risk.
• B. By preventing persistent HPV infection; reduces cervical cancer risk only.
• C. By preventing persistent HPV infection; prevents cervical, oropharyngeal, anal and other HPV-associated cancers.
• D. By treating existing HPV infections to clear cancer risk.

Answer: (C)

HPV vaccination trains the immune system to recognize and block high‑risk HPV types before exposure, producing neutralizing antibodies that prevent initial infection and the persistent infections that can drive cancer development. When the virus doesn’t establish a long‑lasting infection, the downstream cellular changes that lead to cancer—especially in the cervix—don’t occur. Because persistent infection with high‑risk HPV types can cause cancers beyond the cervix, vaccination also lowers risk for cancers in the oropharynx, anus, vulva, vagina, and penis. The vaccine is preventive, not a therapy, so it doesn’t clear existing infections; its greatest benefit comes from being given before exposure to HPV.