Very-high-energy electron therapy
Using very fast electrons instead of photons or protons: a possible way to deliver FLASH-speed radiation to deep tumours from a compact machine.
Electrons in the 100-250 MeV range penetrate deeply, are steerable by magnets, and can be delivered at the ultra-high dose rates associated with the FLASH effect, in principle for a fraction of the cost of a proton facility. Work is at the accelerator-development and preclinical stage at CHUV/CERN, SLAC and elsewhere; the FLASH studies that exist in humans use conventional-energy electrons for skin lesions (for example NCT06549439, completed) or protons. No VHEE patient treatment had been reported by September 2026.
How it works
Very-high-energy electrons deposit a relatively flat depth dose that can be shaped magnetically, enabling deep targets and millisecond delivery.
- Potential FLASH sparing at depth
- Magnetic scanning is fast and precise
- Cheaper and smaller than proton or carbon facilities
- No clinical machine yet
- Dosimetry at ultra-high dose rate is unsolved
- FLASH sparing itself remains unproven in humans
Latest papers
topQuery for this technology: (TITLE:"Very-high-energy electron therapy" OR ABSTRACT:"Very-high-energy electron therapy") AND (cancer OR tumor OR tumour OR oncology OR carcinoma OR lymphoma OR leukemia OR leukaemia OR myeloma OR sarcoma OR melanoma OR glioma). Results are unfiltered search hits about Very-high-energy electron therapy, not a curated reading list.
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