Statement: the secondary trial is testing a Gel which is applied to the breast, whereas the primary trial is testing an intervention which requires daily radiation of the breast.
Primary_evidence: INTERVENTION 1:    ARM 1 Daily Boost   Radiation Therapy   Radiation Therapy: Arm 1= 15 daily radiation fractions of 2.7 Gy, Monday to Friday for 3 weeks, to the whole breast with a daily concomitant boost of 0.5 Gy to the tumor bed, for a total daily dose of 3.2 Gy to the tumor bed (2.7Gy+0.5 Gy). The overall dose will be 40.5 Gy to the breast and 48.0 Gy to the tumor bed.   Arm 2= 15 daily radiation fractions of 2.7 Gy Monday to friday for three weeks to the entire breast with a Friday boost of 2.0 Gy to the tumor bed, for a total dose to the tumor bed on each friday of 4.7 Gy (2.7 Gy+ 2.0 Gy). The overall dose will be 40.5 Gy to the breast and 46.5 gy to the tumor bed. INTERVENTION 2:    ARM 2 Weekly Boost   Radiation Therapy   Radiation Therapy: Arm 1= 15 daily radiation fractions of 2.7 Gy, Monday to Friday for 3 weeks, to the whole breast with a daily concomitant boost of 0.5 Gy to the tumor bed, for a total daily dose of 3.2 Gy to the tumor bed (2.7Gy+0.5 Gy). The overall dose will be 40.5 Gy to the breast and 48.0 Gy to the tumor bed.   Arm 2= 15 daily radiation fractions of 2.7 Gy Monday to friday for three weeks to the entire breast with a Friday boost of 2.0 Gy to the tumor bed, for a total dose to the tumor bed on each friday of 4.7 Gy (2.7 Gy+ 2.0 Gy). The overall dose will be 40.5 Gy to the breast and 46.5 gy to the tumor bed.
Secondary_evidence: INTERVENTION 1:    0.005% Estriol Vaginal Gel   Route: Vaginal. Administration by an applicator inserted deep inside the vagina Dose: 1 g of gel, containing 50 Mcg of estriol Dosage schedule: Weeks 1-3: single daily application Weeks 4-12: twice weekly administration INTERVENTION 2:    Placebo Vaginal Gel   Route: Vaginal. Administration by an applicator inserted deep inside the vagina Dose: 1 g of gel. Dosage schedule: Weeks 1-3: single daily application Weeks 4-12: twice weekly administration Placebo