title: Over-irradiation.
abstract: Decreasing the burden of radiation therapy (RT) for breast cancer includes, next to complete omission, several ways to tailor the extent of RT. Possible options for this include lowering of the total dose, such as selective omission of the boost, hypofractionated RT to shorten the duration of treatment, the selective introduction of partial breast irradiation and anatomy based target volume contouring to decrease the size of the irradiated volumes. Elective regional nodal irradiation showed in several randomised trials and meta-analyses to significantly impact on local-regional control, disease-free survival, breast cancer mortality and overall survival. The generalisability of these results remains complex in the light of the decreasing use of axillary lymph node dissection, the use of more effective adjuvant systemic therapy, the increasing use of primary systemic therapy and continuously improving RT techniques. In general, the use of RT compensates for the decreasing extent of surgery to the breast and the axillary lymph nodes, eliminating residual tumour cells while maintaining better aesthetic and functional results. In some occasions, however, the indications for the extent of RT have to be based on limited pathological staging information. Research is ongoing to individualise RT more on the basis of biological factors including gene expression profiles. When considering age, treatment decisions should rather be based on biological instead of formal age. The aim of this review article is to put current evidence into the right perspective, and to search for an appropriate appreciation of the balance between efficacy and side effects of local-regional RT.
authors: Department of Radiation Oncology, Radboud university medical center, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands. Electronic address: philip.poortmans@radboudumc.nl.
authors: Philip M P
authors: PMP
authors: Poortmans
authors: Department of Radiation Oncology, University Hospital Sant Joan de Reus, Av. del Dr. Josep Laporte, 2, 43204 Reus, Spain. Electronic address: meritxell.arenas@gmail.com.
authors: Meritxell
authors: M
authors: Arenas
authors: Radiation Oncology Unit, Florence University Hospital, Largo G. A. Brambilla, 3, 50134 Florence, Italy. Electronic address: lorenzo.livi@unifi.it.
authors: Lorenzo
authors: L
authors: Livi
mesh_terms: D001365:Axilla; D001943:Breast Neoplasms / Q000737:chemistry / Q000473:pathology* / Q000601:surgery / Q000628:therapy*; D017024:Chemotherapy, Adjuvant / Q000009:adverse effects; D005260:Female; D006801:Humans; D008197:Lymph Node Excision; D008207:Lymphatic Metastasis; D015412:Mastectomy, Segmental; D018714:Radiotherapy, Adjuvant / Q000009:adverse effects; D018570:Risk Assessment
keywords: Breast cancer; Breast conserving therapy; Nodal irradiation; Partial breast irradiation; Radiation therapy