Authors: Tomáš Mrňák, Karel Lehmert Affiliation: Dept. of Criminology & Forensic Studies, University of Finance and Administration, Karlovy Vary, Czech Republic Keywords: radiotherapy, radiation overdose, Épinal, radiological accident, quality assurance, CBRNE
Introduction
Between 2004 and 2006, a serious radiological incident occurred in Épinal, France, involving incorrect administration of radiotherapy to patients with prostate cancer. As a result of errors in both treatment planning and delivery, several hundred patients received higher doses of ionizing radiation than intended. The case is considered one of the most significant radiation overdoses in European medical practice and highlights the combined effect of human error and insufficient quality assurance.
Methodology
This study is based on a review of scientific literature and clinical studies available in PubMed, focusing on radiological accidents and their health effects. Particular attention was given to publications describing clinical outcomes and long-term follow-up of affected patients. Additional sources dealing with the causes of the incident and failures in radiotherapy safety systems were also analysed. For broader context, documents from international organizations such as the IAEA and WHO were reviewed.
Results
Errors in treatment setup and incorrect use of irradiation techniques led to approximately 400–450 patients receiving doses above prescribed levels, in some cases by as much as 20–30%. The overdosing continued over several years before it was identified.
Patients developed severe radiation-induced damage, most commonly affecting the rectum and bladder. Reported complications included chronic ulceration, bleeding, inflammation, and functional disorders. Some patients required repeated surgical interventions, and several deaths were associated with complications resulting from excessive radiation exposure. Due to its scale and consequences, the incident is classified among major radiological events with a significant impact on patient safety and healthcare systems.
Discussion
The main cause of the accident was the introduction of a modified radiotherapy technique without proper validation or dose verification. Human factors played an important role, particularly limited understanding of the new procedure and the absence of systematic dose checks.
Another contributing factor was insufficient quality assurance and a lack of effective control mechanisms that could have enabled earlier detection of the problem. Organizational issues, including inadequate supervision, insufficient staff training, and poor communication within the clinical team, also played a role.
References
- Ash, D., Flynn, A., Battermann, J., et al. (2007). Epinal radiotherapy accident: past, present and future. Clinical Oncology, 19(7), 485–489.
- Derreumaux, S., Etard, C., Huet, C., et al. (2008). Lessons from the Épinal radiotherapy accident. Radiation Protection Dosimetry, 131(1), 130–135.
- Derreumaux, S., Etard, C., Huet, C., et al. (2019). The medical follow-up of the radiological accident: Épinal 2006. Radiation Protection Dosimetry, 187(1–2), 89–97.
- International Atomic Energy Agency. Prevention of Accidental Exposures in Radiotherapy. Vienna: IAEA.
- World Health Organization (2008). Radiotherapy Risk Profile. Geneva: WHO.
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