Summary
Severe viral infections, such as COVID-19, can increase the risk of lung cancer through immune cell changes, though vaccination significantly reduces these long-term harmful effects.
The Connection Between Viral Infections and Lung Cancer Risk
New research published in Cell suggests that severe respiratory infections, such as COVID-19 and influenza, may “reprogram” immune cells in the lungs, creating an environment where cancer can develop more easily months or even years later. Scientists from the University of Virginia (UVA) found that serious illness causes long-lasting inflammation and changes to lung tissue that can accelerate tumor growth.
Key takeaways from the study include:
Increased Risk: Hospitalization for COVID-19 was associated with a 1.24-fold increase in lung cancer incidence, regardless of smoking history.
Immune “Scarring”: Severe infections alter neutrophils and macrophages (immune cells), turning them into “protumor” facilitators instead of protectors.
The Power of Vaccines: Importantly, researchers found that vaccination largely prevents these harmful lung changes by reducing the severity of the initial infection.
Clinical Monitoring: Experts suggest that survivors of severe viral pneumonia may eventually require enhanced lung cancer screening, similar to high-risk smokers.
