Yes, infectious agents are another category of exogenous sources linked to cancer. Certain viruses, bacteria, and parasites have been identified as risk factors. For instance, human papillomavirus (HPV) is strongly associated with cervical cancer, while hepatitis B and C viruses are linked to liver cancer. Additionally, the bacterium Helicobacter pylori is associated with gastric cancer. These agents can lead to chronic infections that cause inflammation and changes in the affected tissues, increasing the likelihood of cancer development.
