Annals of Surgical Oncology

, Volume 25, Issue 1, pp 137–147 | Cite as

Meta-Analysis of Local Invasive Breast Cancer Recurrence After Electron Intraoperative Radiotherapy

  • Jay K. HarnessEmail author
  • Kalatu Davies
  • Christina Via
  • Elizabeth Brooks
  • April Zambelli-Weiner
  • Chirag Shah
  • Frank Vicini
Breast Oncology



Electron intraoperative radiotherapy (IORT) can be used during breast conserving surgery to treat early-stage invasive breast cancer. Using data from current clinical and observational studies, this study aimed to assess the impact of single-fraction electron IORT on local recurrence rates.


Studies on single-fraction electron IORT during breast conserving surgery were identified through a search of PubMed and Google Scholar, as well as through secondary referencing. Local recurrence rate was the main outcome of interest. A meta-analysis of proportions using a binomial distribution to model the within-study variability and a random effects model was conducted to estimate a pooled local recurrence rate. To estimate a 5-year recurrence rate, a single-sample Poisson-normal model was applied to model the probability of events occurring during a fixed period (60 months).


The study identified 13 publications. The analysis demonstrated a pooled monthly local recurrence rate of 0.02% per person-month (95% confidence interval CI 0.00–0.06%) for the studies with a follow-up period shorter than 5 years, 0.03% per person-month (95% CI 0.02–0.06%) for studies with a follow-up period of 5 years or longer, and 0.02% per person-month (95% CI 0.01–0.04%) overall. Based on this model, the predicted 5-year local recurrence rate was 2.7% (range 1.9–3.7%).


According to the published literature, the rate of breast cancer local recurrence after electron IORT was 0.02% per person-month, with an adjusted 5-year recurrence rate of 2.7%. These findings support the recent guidelines from the American Society for Radiation Oncology (ASTRO) supporting the use of electron IORT for low-risk patients.



This study was funded by IntraOp Medical.


Decision Driver Analytics was a paid consultant to IntraOp Medical, and Jay K. Harness, MD, was a speaker for IntraOp Medical.


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Copyright information

© Society of Surgical Oncology 2017

Authors and Affiliations

  • Jay K. Harness
    • 1
    Email author
  • Kalatu Davies
    • 2
  • Christina Via
    • 2
  • Elizabeth Brooks
    • 2
  • April Zambelli-Weiner
    • 2
  • Chirag Shah
    • 3
  • Frank Vicini
    • 4
  1. 1.Center for Cancer Prevention and TreatmentSt. Joseph HospitalOrangeUSA
  2. 2.Decision Driver Analytics/Translational Technologies International, LLCAshevilleUSA
  3. 3.Department of Radiation OncologyCleveland Clinic, Taussig Cancer InstituteClevelandUSA
  4. 4.Michigan Healthcare Professionals21st Century OncologyFarmington HillsUSA

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