Association between Cardiac Radiation Dose, Coronary Artery Calcification Progression, and Complex Tumor Formations in Breast Cancer Patients after Radiotherapy: The Modifying Role of Concomitant Systemic Inflammation

Abstract Radiation therapy (RT) remains a cornerstone in the treatment of breast cancer, particularly for patients with complex tumors characterized by advanced staging, multifocal lesions, or aggressive histological features such as triple-negative or HER2-positive subtypes. However, RT’s benefits are tempered by long-term cardiovascular risks, including accelerated coronary artery calcification (CAC) progression, which is dose-dependent and potentially exacerbated by systemic inflammation. This article explores the intricate associations between cardiac radiation dose, CAC advancement, and the unique challenges posed by complex tumor formations in breast cancer survivors. Drawing from epidemiological data, mechanistic insights, and clinical observations, we highlight how concomitant systemic inflammation—arising from both tumor biology and RT-induced responses—acts as a modifier, amplifying cardiac toxicity. In patients with complex tumors, heightened baseline inflammation from tumor microenvironments maysynergize with RT effects, leading to more aggressive CAC and increased incidence of coronary artery disease (CAD). We propose integrated screening and management strategies aligned with American Heart Association (AHA) guidelines to mitigate these risks. Key findings underscore the need for personalized RT planning, inflammation-targeted interventions, and long-term surveillance in this high-risk cohort.