The human papillomavirus — long studied but still not fully understood

Large-scale epidemiological studies have been invaluable in establishing a causal relationship between persistent genital human papillomavirus (HPV) infection and the development of invasive cervical cancer. The human papillomavirus is the most common sexually transmitted viral infection worldwide and is associated with various cancers in both women and men. Of the more than 200 identified HPV types, high-risk HPV types (HR-HPV-16, -18, -31, -33, -35, -45, -52, and -58) are responsible for nearly all cases of cervical cancer. Increasing evidence also links these types to other anogenital cancers, including anal, vulvar, vaginal, penile, and head and neck cancers. The human papillomavirus types 16 and 18 are detected in approximately 95% of cervical cancer cases. Nearly 50% of vulvar squamous cell carcinomas are HPV16-positive. The viral DNA genome encodes eight genes, which are classified into three functional groups: those necessary for replication, and those associated with either low-risk or high-risk types. Among the high-risk genotypes, HPV16 (66-82%) and HPV18 (26–34%) are the most significant contributors to HPV-related cancers. Vaccination represents a promising approach to preventing HPV infection. This issue is not only clinically and epidemiologically important, but it also has significant sociological implications. Educating the public about HPV and its role in cancer development increases awareness, which in turn makes individuals more likely to get vaccinated or to vaccinate their children.