Prospective Phase II Study of Intraoperative Radiotherapy (IORT) in Elderly Patients with Small Breast Cancer
- Conditions
- Breast NeoplasmsNeoplasmsBreast DiseasesNeoplasm Recurrence, Local
- Interventions
- Radiation: intraoperative radiotherapy
- Registration Number
- NCT01299987
- Lead Sponsor
- Universitätsmedizin Mannheim
- Brief Summary
This prospective, multicentric single arm phase II study is based on the protocol of the international TARGIT-A study. The purpose is to investigate the efficacy of a single intraoperative radiotherapy treatment within elderly low risk patients (≥ 70 years, cT1, cN0, cM0, invasive-ductal) which is followed by WBRT only when risk factors are present. In presence of risk factors postoperative WBRT will be added to complete the radiotherapeutic treatment according to international guidelines.
- Detailed Description
Patients ≥ 70 years with small, low-risk breast cancer who are operated but not irradiated show local relapse rates around 4% after 4 years. With adjuvant whole breast radiotherapy (WBRT) the local relapse rate drops to 1% after 4 years under Tamoxifen (Hughes et al 2004). It has been demonstrated (Polgar et al. 2007, Vaidya et al. 2010) that the efficacy of radiation of the tumor bed only in a selected group can be non-inferior to WBRT. The TARGIT E study should confirm the efficacy of a single dose of intraoperative radiotherapy (IORT) in a well selected group of elderly patients with small breast cancer and absence of risk factors. In presence of risk factors postoperative WBRT will be added to complete the radiotherapeutic treatment according to international guidelines.
Endpoints are the local relapse rate (within 2 cm of the tumor bed), ipsilateral relapse, cancer-specific and overall survival and contralateral breast cancer as well as documentation of quality of life and cosmetic outcome. The expected local relapse rates are 0.5/1/1.5% after 2.5/5/7.5 years, respectively.
Discontinuation of the trial is scheduled if rates of local relapse rates rise to 3/4/6% after 2.5/5/7.5 years. Power calculations result in 265 patients with a calculated loss to follow-up of 20%, an alpha of 0.05 and a beta 0.1. Only centers with access to the Intrabeam® system (Carl Zeiss) can recruit patients into the trial.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- Female
- Target Recruitment
- 591
- cT1c cN0 cM0
- ≥ 70 years old
- invasive-ductal histology
- compliance
- informed consent
- extensive intraductal component (EIC)
- multifocality /-centricity
- lymph vessel invasion (L1)
- clinical signs of distant metastases or clinically suspicious lymph nodes
- other histology
- < 70 years old
- missing informed consent or non-compliance
- bilateral breast cancer at time of diagnosis
- known BRACA 1/2 mutations (genetic testing not required)
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- SINGLE_GROUP
- Arm && Interventions
Group Intervention Description Intraoperative radiotherapy intraoperative radiotherapy single arm with intraoperative radiotherapy
- Primary Outcome Measures
Name Time Method Local Relapse up to ten years Rate of local relapse (within 2cm of the initial tumor bed)
- Secondary Outcome Measures
Name Time Method Cosmesis up to 7.5 years BCCT.Core analysis of cosmesis
Overall Survival up to ten years Death is an event
Ipsi- or Contralateral Breast Cancer up to ten years Rate of ipsilateral and contralateral breast cancer events
General and breast-specific Quality of Life after IORT up to 10 years EORTC questionnaires QLQ C30 and BR23
Late toxicity after IORT up to ten years LENT-SOMA based toxicity at all FU time points
Trial Locations
- Locations (1)
Universitätsmedizin Mannheim UMM
🇩🇪Mannheim, Baden-Württemberg, Germany