Ultra-hypofractionated Radiotherapy in Breast Cancer Patients

"All enrolled patients will be treated with an ultra-ipofractionated whole breast irradiation schedule (26 Gy delivered in 5 consecutive fractions, single dose 5.2 Gy), according to FAST-Forward trial. Whole bresat irradiation should be followed or not by a tumor bed boost (sequential: 7.6 Gy in 2 consecutive fractions, single dose 3.8 Gy or simultaneous intergrated boost: 30 Gy in 5 consecutive fractions, single dose 6 Gy). Either three-dimensional conformal radiotherapy (3DCRT), intensity-modulated radiotherapy (IMRT), volumetric modulated arc therapy (VMAT) or helicoildal techniques are allowed. Breath control techniques may be used at the discretion of each partecipating centre.~Main exclusion critereria are mastectomy and regional nodal irradiation. Neoadjuvant and/or adjuvant systemic therapies are allowed."