In a recent publication of Wallner et al. [ ] the authors retrospectively analyzed data of 312 consecutively treated intracoronary brachytherapy (ICBT) patients with a long follow-up and frequently found far higher vascular wall doses than prescribed. Since they didn't observe high doses resulting in complications, authors suggest in the future more comprehensive, prospective studies to clear the optimal dose of the treatments. The idea is also supported by literature data, stating, similarly to other treatments for malignant tumors, a dose - treatment effectivity relationship also in intravascular interventional radiotherapy (brachytherapy) [ , ].