New research reveals that respiratory viruses like influenza and COVID-19 can reactivate dormant breast cancer cells in the lungs of patients in remission, significantly increasing the risk of relapse and death. Studies in mice and human data show a correlation between viral infections and a higher incidence of metastatic breast cancer. The immune system's response to these viruses may create an environment conducive to cancer cell proliferation. While further research is needed, the findings highlight the importance of preventative measures, such as vaccination, for breast cancer survivors.

Prepared by Olivia Bennett and reviewed by editorial team.