Infection Associated Cancers
🦠➡️🎗️ Infection-related cancers account for a substantial proportion of the global cancer burden. Certain chronic infections act as oncogenic drivers through persistent inflammation, immune dysregulation, and direct genetic damage. Recognising these links is crucial for prevention, screening, and early intervention.
📘 Overview
Infectious agents contribute to carcinogenesis via several mechanisms: chronic inflammation leading to repeated cellular turnover, production of oncogenic proteins, integration of viral DNA into host genomes, and impairment of immune surveillance. Many of these cancers are largely preventable through vaccination, antimicrobial treatment, and public health measures.
🧬 Infections Associated with Cancer
| 🦠 Causative Agent |
🎗️ Associated Cancers |
🛡️ Prevention & Risk Reduction |
| Human Papillomavirus (HPV) 🧬 |
- 🎗️ Cervical cancer
- 🗣️ Oropharyngeal cancer
- 🚻 Anal cancer
- ♂️♀️ Penile & vulvar cancer
|
- 💉 HPV vaccination (school-based NHS programme)
- 🧪 Cervical screening (smear test)
- 🛑 Barrier contraception & safer sex
|
| Hepatitis B Virus (HBV) 🩸 |
- 🎗️ Hepatocellular carcinoma (HCC)
|
- 💉 Universal & high-risk group vaccination
- 🧪 Screening of pregnant women & blood products
- 💊 Antiviral treatment for chronic HBV
|
| Hepatitis C Virus (HCV) 🧪 |
- 🎗️ Hepatocellular carcinoma
|
- 🔍 Targeted screening (e.g. PWID, transfusions pre-1991)
- 💊 Curative direct-acting antivirals (DAAs)
- 🩺 Surveillance for cirrhosis-related HCC
|
| Epstein–Barr Virus (EBV) 🧠 |
- 🎗️ Nasopharyngeal carcinoma
- 🧬 Burkitt lymphoma
- 🧬 Hodgkin lymphoma
|
- ⚠️ No vaccine available
- 👁️ High suspicion in endemic areas or immunosuppression
- 🩺 Early recognition of lymphoproliferative disease
|
| Helicobacter pylori 🍽️ |
- 🎗️ Gastric adenocarcinoma
- 🧬 Gastric MALT lymphoma
|
- 💊 Eradication therapy (PPI + antibiotics)
- 🔍 Test-and-treat strategy in dyspepsia
- 🩺 Surveillance in high-risk patients
|
| Human Immunodeficiency Virus (HIV) 🧑⚕️ |
- 🎗️ Kaposi sarcoma
- 🧬 Non-Hodgkin lymphoma
- 🎗️ Cervical cancer
|
- 💊 Lifelong antiretroviral therapy (ART)
- 🧪 Enhanced cancer screening programmes
- 🛡️ Safer sex & harm-reduction strategies
|
| HTLV-1 🧫 |
- 🧬 Adult T-cell leukaemia/lymphoma (ATLL)
|
- 🩸 Blood donor screening
- 🛑 Avoid breastfeeding if infected
- 🛡️ Safer sexual practices
|
| Schistosoma haematobium 🐌 |
- 🎗️ Squamous cell carcinoma of the bladder
|
- 💊 Antiparasitic treatment (praziquantel)
- 🚱 Avoid freshwater exposure in endemic regions
- 🌍 Public health water control programmes
|
🧠 Key Teaching Points
- 🔄 Chronic inflammation is a major driver of infection-related carcinogenesis
- 💉 Vaccination (HPV, HBV) is among the most effective cancer prevention tools
- 🧪 Treating chronic infection (H. pylori, HCV) can reverse or prevent malignancy
- 📍 Many infection-associated cancers cluster in specific geographic regions
✅ Conclusion
A significant proportion of cancers are preventable through infection control. Vaccination, antimicrobial therapy, safe practices, and targeted screening represent powerful tools in reducing cancer incidence. For clinicians, recognising these links supports earlier diagnosis and reinforces the importance of public health interventions.
