Which HPV Types Are the Most Dangerous? Understanding HPV

Among these, HPV-16 and HPV-18 are considered the most dangerous types due to their strong association with cervical cancer and several other cancers.

HPV-16 and HPV-18: The Highest-Risk HPV Types

HPV-16 and HPV-18 are responsible for approximately 70% of cervical cancer cases worldwide.

These two high-risk HPV types are also associated with several other cancers, including:

• Anal cancer.

• Oral and throat cancer.

• Penile cancer.

• Vaginal cancer.

Although HPV infection is common, not everyone who becomes infected will develop cancer. The risk increases when a high-risk HPV infection persists over time.

Why Are HPV-16 and HPV-18 Particularly Dangerous?

1. They Can Cause Cancerous Changes in Cells

HPV-16 and HPV-18 can produce viral proteins called E6 and E7, which interfere with important proteins that normally regulate cell growth.

These include:

• p53 - A protein that helps prevent damaged cells from dividing uncontrollably.

• Rb - A protein that helps regulate the normal cell cycle.

When these protective mechanisms are disrupted, infected cells may begin dividing abnormally. Over time, persistent infection can contribute to the development of cancer.

2. They Can Cause Persistent Infections

In most cases, the immune system can clear HPV infections naturally within 1-2 years.

However, high-risk HPV types such as HPV-16 and HPV-18 may persist in the body for longer periods.

Persistent infection increases the likelihood of abnormal cell changes and may eventually lead to cancer if these changes are not detected and managed.

3. They Have a Higher Cancer Risk Than Other HPV Types

More than 10 HPV types are classified as high-risk, including:

• HPV-31.

• HPV-33.

• HPV-45.

• HPV-52.

• HPV-58.

However, HPV-16 and HPV-18 account for the largest proportion of HPV-related cancers, particularly cervical cancer.

This makes them important targets for HPV vaccination and cancer prevention programs.

How Can HPV Infection Be Prevented?

Several preventive measures can help reduce the risk of HPV infection and related cancers.

1. Get Vaccinated Against HPV

HPV vaccination is one of the most effective ways to protect against high-risk HPV infections.

HPV vaccines have been developed to protect against 2, 4, or 9 HPV types.

Vaccination is recommended at a young age, ideally before becoming sexually active, although eligibility depends on age and national vaccination guidelines.

2. Undergo Regular Cervical Cancer Screening

Regular cervical cancer screening helps detect high-risk HPV infections or abnormal cervical cell changes before cancer develops.

Common screening methods include:

• Pap smear - Examines cervical cells for abnormalities.

• HPV DNA test - Detects high-risk HPV types associated with cervical cancer.

Screening remains important even for individuals who have received HPV vaccination.

3. Use Condoms During Sexual Activity

Condoms can reduce the risk of HPV transmission during sexual contact.

However, they do not provide complete protection because HPV can spread through contact with infected skin that is not covered by a condom.

4. Reduce Risk Factors

Certain behaviors may increase the risk of HPV exposure or persistent infection.

Preventive measures include:

• Reducing exposure to multiple sexual partners.

• Avoiding smoking.

• Maintaining healthy lifestyle habits that support normal immune function.

Conclusion

HPV-16 and HPV-18 are the most significant high-risk HPV types because they can cause persistent infections and interfere with normal cell growth, increasing the risk of cancer.

Together, they are responsible for approximately 70% of cervical cancer cases worldwide and are also associated with other cancers.

HPV vaccination, regular cervical cancer screening, condom use, and reducing risk factors are important measures for preventing HPV-related diseases.

 

Reference :

Chularat Cancer Center Which HPV Types Are the Most Dangerous?

ArokaGO Providers Targeted Therapy Cancer Center