Correlation Between COVID-19 and Radiation Pneumonitis in Breast Cancer

This study was designed as a single-center retrospective analysis aimed at investigating whether COVID-19 infection increases the risk or burden of radiation-induced pneumonitis in breast cancer patients. Breast cancer patients who underwent radiotherapy at the Cancer Center of Zhejiang Hospital between January 1, 2021, and June 30, 2024, were screened for eligibility. Patients who met the inclusion criteria were identified through the hospital information system, and their clinical records were reviewed. Follow-up was conducted via telephone interviews.