79 patients with non-small cell lung or esophageal cancer, and 246 patients with breast cancer to be treated with curative R(CH)T at the University Hospital Carl Gustav Carus Dresden, Germany will be included in this investigation. Dosimetric parameters from the applied radiation treatment plans, magnetic-resonance-imaging, electrocardiography, transthoracic echocardiography as well as blood-biomarkers will be collected to determine their predictive power against the primary endpoint of cumulative grade ≥ 2 cardio-toxicity (Common Terminology Criteria for Adverse Events \[CTCAE\] v 5.0) 3-5 years after R(CH)T.
