Accelerated Radiation Therapy (ART) to the Breast and Nodal Stations

The study will also include patients who because of COVID had undergone up to 3 months neoadjuvant hormonal therapy before surgery for clinical T1/T2 BC. Inclusion Criteria: * Age older than 18 * Pre- or post-menopausal women with Stage I-III breast cancer * Status post neoadjuvant systemic therapy * Status post-chemotherapy breast surgery * Original biopsy-proven invasive breast cancer, excised with negative margins of at least 1 mm (patients with focally positive margin are not excluded). * Status post segmental mastectomy or mastectomy, with either negative sentinel node biopsy and/or axillary node dissection (at least 6 nodes removed). * Patient needs to be able to understand and demonstrate willingness to sign a written informed consent document Exclusion Criteria: * Previous radiation therapy to the ipsilateral breast and/or nodal area * Active connective tissue disorders, such as lupus or scleroderma requiring flare therapy * Pregnant or lactating women * Concurrent chemotherapy, with the exception of anti HER2neu therapies * Inadequate axillary dissection in a setting of positive sentinel node * Patients with more than 5 nodes involved at axillary dissection will be excluded from this study since they will be eligible to receive radiotherapy to level I and II axilla.