Single Fraction High-Gradient Partial Breast Irradiation in Treating Patients With Low-Risk Stage 0-I Breast Cancer

This is a phase I/II study which will evaluate the complication rates, local control, cosmetic results, and quality of life of single fraction high gradient partial breast irradiation (HG-PBI) when used as the sole method of radiation therapy for patients with pathologic stage 0 (=\< 2 cm) or I carcinoma of the breast treated with partial mastectomy with histologically assessed negative surgical margins.