1. Tumor Viruses

2. Tumor Viruses- animal viruses capable of causing cancer
DNA tumor viruses
retroviruses (RNA)

3. DNA viruses Hepatitis B viruses smallest genomes of DNA viruses
infect liver cells
drive abnormal proliferation and cell survival

4. DNA viruses
Simian virus 40 and polyomavirus- not associated with human cancer
viral gene integrates with DNA of cell
results in transformation

5. DNA viruses Papillomaviruses infect epithelial cells
warts or malignant tumors
cervical cancer
interferes with apoptosis

6. DNA viruses Adenoviruses used as models in cancer biology
not naturally associated with cancers in humans and animals

7. DNA viruses Herpesviruses Epstein Barr virus lymphoma and carcinoma
transforms B lymphocytes

8. Retroviruses RNA viruses HIV Rous Sarcoma Virus
first viral oncogene discovered