Women with invasive carcinoma of the breast less than 3 cm with negative axillary nodes , following BCS, who meet the inclusion criteria will be approached for potential study enrollment.~Eligible, consenting patients will be randomly allocated to receive radiotherapy of 3DCRT WBI 50 Gy in 25 fractions over 5 weeks or APBI 38.5 Gy in 10 once daily fractions of 3.85Gy over two weeks or 38.5 Gy in 10 twice daily fractions of 3.85 Gy over one week. Patients will be followed at 6, 12, 18 and 24 months post randomization. Cosmetic outcome will be measured using photographs and evaluated by a panel of trained radiation oncologists using the EORTC Breast Cosmetic Rating System. Radiation toxicity will be assessed using the NCI CTCAE version 4.0. The primary outcome is to compare the acute, late toxicities and adverse cosmetic outcomes at 6, 12 and 18 months among the three groups.
This is a randomized phase III trial in women with invasive carcinoma of the breast with negative axillary nodes treated by Breast Conserving Surgery (BCS). Eligible, patients will be randomly allocated to receive radiotherapy of 3 Dimensional Conformal Radiation Therapy (3DCRT) Whole Breast Irradiation (WBI) 50 Gray (Gy) in 25 daily fractions over 5 weeks or Accelerated Partial Breast Irradiation (APBI) 38.5 Gy in 10 daily fractions of 3.85Gy over two weeks or 38.5 Gy in 10 twice daily fractions of 3.85Gy over one week. Patients will be followed at 6, 12, 18 and 24 months post randomization. Cosmetic outcome will be measured using photographs and evaluated by a panel of trained radiation oncologists. Radiation toxicity will be assessed using National Cancer Institute Common Terminology Criteria for Adverse Events (NCI-CTCAE).