BCT	Breast-Conserving Therapy
BCS	Breast-Conserving Surgery
WBI	Whole-Breast Irradiation
PBI	Partial Breast Irradiation
IORT	Intraoperative Radiotherapy
EBRT	External Beam Radiotherapy
3D-CRT	Three-Dimensional Conformal Radiotherapy
IMBT	Intensity-Modulated Brachytherapy
LINAC	Linear Accelerator
MRgRT	Magnetic Resonance-Guided Radiotherapy
GTV	Gross Tumor Volume
PTV	Planning Target Volume
Gy	Gray (Unit of Radiation Dose)
RCT	Randomized Controlled Trial
IBTR	Ipsilateral Breast Tumor Recurrence
ABS	American Brachytherapy Society
ASTRO	American Society for Radiation Oncology
GEC-ESTRO	Groupe Européen de Curiethérapie—European Society for Radiotherapy and Oncology
MRI	Magnetic Resonance Imaging
ER	Estrogen Receptor