How does hpv cause cancer

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Last updated: April 8, 2026

Quick Answer: HPV causes cancer primarily through persistent infection with high-risk strains that disrupt normal cell regulation. The virus integrates its DNA into host cells, producing E6 and E7 oncoproteins that inactivate tumor suppressors p53 and pRB, leading to uncontrolled cell growth. Approximately 5% of all cancers worldwide are attributed to HPV, with cervical cancer being the most common (over 95% of cases linked to HPV). Vaccination programs since 2006 have significantly reduced HPV-related cancers, with the 9-valent vaccine protecting against strains causing about 90% of cervical cancers.

Key Facts

HPV causes about 5% of all cancers globally, with cervical cancer being most strongly associated
Over 95% of cervical cancers are linked to HPV infection, primarily strains 16 and 18
HPV vaccination was first introduced in 2006 and has reduced cervical precancers by up to 88% in vaccinated populations
The virus produces E6 and E7 proteins that disable tumor suppressors p53 and pRB, leading to uncontrolled cell division
Persistent infection with high-risk HPV strains for 10-20 years typically precedes cancer development

Overview

Human papillomavirus (HPV) is a group of more than 200 related viruses, with approximately 40 types transmitted through sexual contact. First identified in the 1980s as a cause of cervical cancer, HPV has since been recognized as responsible for multiple cancers. The link between HPV and cervical cancer was established through epidemiological studies showing nearly all cervical cancer patients had HPV DNA in tumor cells. In 2008, Harald zur Hausen received the Nobel Prize for discovering HPV's role in cervical cancer. Globally, HPV causes approximately 5% of all cancers, including nearly all cervical cancers, 90% of anal cancers, 70% of oropharyngeal cancers, and significant percentages of vaginal, vulvar, and penile cancers. The World Health Organization estimates HPV causes 570,000 new cancer cases annually, with cervical cancer alone causing 311,000 deaths in 2018. Vaccination programs began in 2006 with the quadrivalent vaccine, followed by bivalent (2007) and 9-valent (2014) versions.

How It Works

HPV causes cancer through a multi-step process beginning with infection of basal epithelial cells, typically in the cervix, anus, or oropharynx. High-risk HPV strains (notably types 16 and 18) integrate their viral DNA into the host genome during persistent infection. This integration leads to overexpression of viral oncoproteins E6 and E7, which are the primary drivers of carcinogenesis. E6 binds to and degrades the tumor suppressor protein p53 through ubiquitin-mediated proteolysis, preventing apoptosis (programmed cell death) in damaged cells. Simultaneously, E7 binds to and inactivates retinoblastoma protein (pRB), releasing E2F transcription factors that drive uncontrolled cell cycle progression. These disruptions allow cells to bypass normal growth controls, accumulate genetic mutations, and eventually form precancerous lesions (CIN, AIN, or PIN). Over 10-20 years, these lesions can progress to invasive carcinoma through additional genetic alterations in host cells. The virus evades immune detection by limiting viral protein expression in basal cells and downregulating interferon responses.

Why It Matters

HPV-related cancers represent a significant global health burden, particularly affecting women in low-resource regions where screening and vaccination access is limited. Cervical cancer remains the fourth most common cancer in women worldwide, with 85% of cases occurring in developing countries. The economic impact is substantial, with treatment costs for advanced cervical cancer exceeding $100,000 per patient in developed nations. HPV vaccination has demonstrated remarkable effectiveness, reducing HPV 16/18 infections by 83% among vaccinated teenage girls and cervical precancers by 88% in young women. The WHO's 2020 global strategy aims to eliminate cervical cancer through 90% vaccination coverage, 70% screening, and 90% treatment access by 2030. Beyond health impacts, HPV-related cancers carry social stigma and can affect fertility, relationships, and quality of life. Public health efforts focus on increasing vaccination rates, improving screening with HPV DNA testing, and developing therapeutic vaccines for existing infections.