Human papillomaviruses hpvs are a group of more than 200 related viruses that can cause several cancers including cervical cancer anal cancer and . During the past 20 years several types of human papillomaviruses hpvs have been identified that cause specific types of cancers the etiology of cancer . Papillomaviruses and cancer human papillomaviruses clinical management of cervical cancer and head and neck squamous cell carcinomas . Members of the sixth family of tumor viruses in infected cells the viruses that cause human cancer include hepatitis b virus liver cancer papillomaviruses
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