Partial Breast Versus Whole Breast Irradiation in Elderly Women Operated on for Early Breast Cancer

Partial Breast Versus Whole Breast Irradiation to Women ≥ 60 Years Operated With Breast Conservation for Early Breast Cancer: a Randomized Fase II Trial

The purpose of this trial is to investigate the difference in late radiation morbidity between partial breast irradiation and whole breast irradiation given to women operated on with breast conservation surgery for early breast cancer with a low risk of local recurrence.

The study is 2-armed. In both treatment arms the radiotherapy consists of 40 Gy in 15 fractions, 2.67 Gy per fraction. The primary endpoint in the trial is late radiation morbidity evaluated as fibrosis, secondary endpoints are other types of late morbidity, rate of local recurrence and an attempt to establish a genetic risk profile for development of late radiation morbidity. The hypothesis is that women operated with breast conservation for a breast carcinoma with low risk of local recurrence can be offered partial breast irradiation without risking more late radiation morbidity compared to whole breast irradiation.

Any other late morbidity after adjuvant radiotherapy, genetic risk profile for late morbidity, recurrence/survival

Inclusion Criteria: women 60 years or older operated for unilateral, unifocal early breast cancer pT1, pN0, M0, grade I or II, positive estrogen and/or progesterone receptor, HER2 negative Exclusion Criteria: lobular carcinoma

Offersen BV, Overgaard M, Kroman N, Overgaard J. Accelerated partial breast irradiation as part of breast conserving therapy of early breast carcinoma: a systematic review. Radiother Oncol. 2009 Jan;90(1):1-13. doi: 10.1016/j.radonc.2008.08.005. Epub 2008 Sep 8. Erratum In: Radiother Oncol. 2011 Feb;98(2):254. Radiother Oncol. 2011 May;99(2):254.

Offersen BV, Alsner J, Nielsen HM, Jakobsen EH, Nielsen MH, Stenbygaard L, Pedersen AN, Thomsen MS, Yates E, Berg M, Lorenzen EL, Jensen I, Josipovic M, Jensen MB, Overgaard J; Danish Breast Cancer Group Radiotherapy Committee. Partial Breast Irradiation Versus Whole Breast Irradiation for Early Breast Cancer Patients in a Randomized Phase III Trial: The Danish Breast Cancer Group Partial Breast Irradiation Trial. J Clin Oncol. 2022 Dec 20;40(36):4189-4197. doi: 10.1200/JCO.22.00451. Epub 2022 Aug 5.