Randomized Trial on Intraoperative Radiotherapy Full Dose Vs External Radiotherapy

Overview

The purpose of this study is to investigate the efficacy of exclusive intraoperative radiation therapy after conserving surgery in early-stage breast cancer compared with whole breast radiotherapy. The primary outcome was the rate of ipsilateral true recurrence ( any recurrence at or close to primary tumor bed) and new ipsilateral tumors ( any recurrence occurring in quadrants other than the previous one) and the recurrence free survival.

The ELIOT trial is a prospective single center randomised phase III trial which compared intraoperative radiotherapy with electrons to the tumor bed with conventional scheme of whole breast external beam radiotherapy. Patients were randomly allocated to intraoperative radiotherapy group or external radiotherapy group in a 1:1 ratio. The rationale for providing partial breast irradiation to the tumor bed lies on the patterns of ipsilateral breast tumor relapse reported in Literature. In fact, the majority of recurrences occur close to the tumor bed. Several randomized trials of breast conserving surgery with or without whole breast radiotherapy showed that in 75-90% of cases recurrences were at the site of original primary tumor. In this context, limiting irradiation to the tumor bed may result in a similar local control as whole breast irradiation, provided that patients are properly selected. The intraoperative treatment was delivered with a mobile miniaturized accelerator, located in the operating room, while for external radiotherapy a 6 MV linear accelerator was used. The surgical technique to perform ELIOT has been standardized in every step. The breast gland is prepared by separating it from the subcutaneous tissue and the underlying pectoralis muscle and by restoring the continuity of the surgical breach after having protected the thoracic wall by lead and aluminium disks to optimize the delivered dose. The linear accelerator delivers electrons at variable energy, ranging from 3 to 9 MeV: the proper electron energy is chosen according to the target thickness. Collimation is achieved by hard-docking system, consisting of 5 mm thick high- quality polymethyl methacrylate round applicators of 4 to 10 -cm diameter. For radiation protection a primary beam stopper and mobile 1.5 cm thick lead shields are provided. The prescribed dose was 21 Gy at the 90% isodose. After delivery of the radiation dose, the applicator and the disk were removed and the gland is reconstructed again. In the conventional arm of the study, the external beam radiotherapy is given after the full recovery from the surgical excision. All patients undergo virtual simulation including a treatment-planning CT scan. The clinical target volume is defined to extend to 5 mm below the skin surface and include breast parenchyma down to the deep fascia, but not including the underlying muscle and rib cage. The irradiated volume should extend medially to the midline, laterally to the mid axillary line and inferiorly to 1-2 cm below the level of intra-mammary fold and superiorly to the suprasternal notch. Using BEV, the blocks are used to shield as much heart and lung as possible without compromising the PTV. Treatment is delivered by a pair of tangential fields with wedges as necessary. The prescribed dose to the whole-breast was 50 Gy delivered in 2 Gy fraction over 5 weeks with a 6 -megavolt linear accelerator followed by a sequential boost of 10 Gy to the tumor bed with electrons. A PTV dose homogeneity of -5% + 7% as recommended by ICRU (International Commission on Radiation Units and Measurements) report no 50. Patients were followed up with at least 6-month clinical examination up to 5 years and then every 8 months thereafter. Annual mammogram was performed .

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Eligibility

Locations (1)

Outcomes