What type of vaccines are currently being developed to aid in cancer prevention?

The correct choice focuses on preventive vaccines that specifically target oncogenic viruses, which are known to contribute to the development of certain types of cancer. The HPV vaccine is a prime example of this approach, as it has been shown to prevent cervical and other types of cancers associated with the human papillomavirus. These vaccines function by stimulating the immune system to recognize and attack cancer-causing viruses, thereby reducing the risk of developing related cancers.

In contrast, therapeutic vaccines are designed for individuals who already have cancer and aim to stimulate the immune response against existing tumors, while allergens-based vaccines are used to treat allergies rather than cancer. General flu vaccines provide protection against influenza but are unrelated to cancer prevention. Understanding the distinction between these types of vaccines helps clarify the specific role that preventive vaccines play in reducing cancer risk.