Statement: Accelerated partial Breast breast irradiation is used in some form for both cohorts of the secondary trial, but not at all in the primary trial.
Primary_evidence: INTERVENTION 1:    Sentinel Lymph Node Biopsy With Radiolabeled Methylene Blue   One arm diagnostic using 1 mCi of 125-I Methylene blue dye to find sentinel lymph nodes
Secondary_evidence: INTERVENTION 1:    Whole Breast Irradiation (WBI)   Conventional whole breast irradiation (WBI)   Whole breast irradiation (WBI): Conventional whole breast irradiation (WBI) INTERVENTION 2:    Partial Breast Irradiation (APBI)   Accelerated partial breast irradiation (APBI)   Accelerated partial breast irradiation (APBI): Accelerated partial breast irradiation (APBI) using intensity modulated radiotherapy (IMRT)