Partial breast irradiation delivered by interstitial HDR BT or EB for a selected group of early-stage breast cancer patients produces similar ten-year results to those achieved with conventional WBI. Significantly better cosmetic outcome can be achieved with HDR BT implants compared with the outcome after WBI.

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Five-year results of our phase I-II study prove that sole HDR-BT of the tumor bed with careful patient selection and adequate quality assurance is a feasible alternative to WBRT. However, long-term results of phase III trials are required to determine the equivalence of TBRT alone, compared with WBRT in the management of selected patients with early breast cancer.