Statement: Neither cohorts of the primary trial receive any medication orally, by IV or by radiation.
Primary_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)