“…The broad spectrum of possible ways to deliver a boost is reflected in the Austrian Patterns-of-Care Studies including low-dose-rate brachytherapy (PCS85), HDR brachytherapy (PCS85, PCS93, and PCS01), external teletherapy (PCS85, PCS93, and PCS01), and intraoperative teletherapy (PCS01). While some centers in Austria have a history of operational experience with implants [6,11,21,26,29], others prefer teletherapy [34] or investigate intraoperative techniques [24,25,28]. Whenever discussing the proportion of "additional boost" treatment in a patient cohort, it is imperative that the total dose to the breast/ chest wall is taken into account.…”