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The highest-risk types are HPV 16 and 18; these are responsible for the vast majority of HPV-related cancers, including cancers of the cervix, vagina, vulva, penis, anus, and head and neck.
Because HPV type 16 is the most common type found in oropharyngeal cancer, p16 immunohistochemistry is one test option used to determine if HPV is present, [135] which can help determine course of treatment since tumors that are negative for p16 have better outcomes.
Papillomaviridae is a family of non-enveloped DNA viruses whose members are known as papillomaviruses. [1] Several hundred species of papillomaviruses, traditionally referred to as "types", [2] have been identified infecting all carefully inspected mammals, [2] but also other vertebrates such as birds, snakes, turtles and fish.
HPV types 6 and 11 are responsible for causing majority of genital warts whereas HPV types 16, 18, 31, 33, and 35 are also occasionally found. [5] It is spread through direct skin-to-skin contact, usually during oral , manual , vaginal , or anal sex with an infected partner.
Nearly 1 in 3 men have at least one type of HPV. But the burden of screening for this widespread STI is on women. Experts explain why.
Cervical intraepithelial neoplasia (CIN) means the development of abnormal cells on the surface of the cervix. It is caused by an HPV infection but in most cases, it is resolved by the immune system. However, a small percentage of people might develop a more serious CIN which, if left untreated, can develop into cervical cancer.
In the case of a relatively normal delivery of offspring other health issues can arise. About 16% of pregnancies in 2019 had hypertensive disorders. Overall pregnancy mortality has been increasing over time and pregnancy-related mortality ratios for black women were more than three times higher than for white women. [59]
The cause of CIN is chronic infection of the cervix with HPV, especially infection with high-risk HPV types 16 or 18. It is thought that the high-risk HPV infections have the ability to inactivate tumor suppressor genes such as the p53 gene and the RB gene, thus allowing the infected cells to grow unchecked and accumulate successive mutations, eventually leading to cancer.