Statement: Only patients in the primary trial receive 40.5 Gy of brachytherapy, patients in the secondary trial receive no radiotherapy whatsoever.
Primary_evidence: INTERVENTION 1:    Accelerated Intensity Modulated Radiation Therapy (AIMRT)   All patients shall receive a total of 40.5 Gy to the entire breast in 2.7 Gy/fraction x 15 fractions, Monday to Friday for 3 weeks delivered prone in uniform daily doses through IMRT tangent fields. A concurrent boost to the original tumor bed of 0.50 Gy will be delivered.   Accelerated intensity modulated radiation therapy (AIMRT)
Secondary_evidence: INTERVENTION 1:    AeroForm Tissue Expander   AeroForm Tissue Expansion inflation with carbon dioxide by remote control   AeroForm Tissue Expander: The AeroForm Tissue Expander is a breast tissue expander implanted following mastectomy and activated by remote control to release small doses of carbon dioxide from an internal reservoir to fill and inflate the expander.