What guides regional nodal irradiation in node positive breast cancer following upfront sentinel lymph node biopsy? - Putora PM; Henke G; Beşe N; Boersma L; Coles CE; de Boniface J; Duane F; Gabryś D; Jagsi R; Kim K; Kirby AM; Marta GN; et al. (Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology, 2025)