About 8 out of 10 squamous cell anal cancers are caused by either HPV-16 or HPV-18 -- the same types of genital HPV that cause cervical cancer. Nearly half of cancers of the vulva and about 7 out of 10 vaginal cancers are HPV-related. Some other genital cancers (cancers of the penis and urethra) and some head and neck cancers (mostly the throat, tongue, and tonsils) are related to the high-risk types of HPV, too. Also, many of the skin cancers in people with weak immune systems contain the HPV virus.
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