A very fast type of radiation worked as well in mice with brain tumors
Original title: Differential and regionally distinct molecular responses distinguish FLASH and conventional RT in a medulloblastoma model while preserving therapeutic outcomes
How far along is this research?
This is a preprint. Other scientists have not checked it yet, so treat it as an early signal rather than an answer.
This was only done in mice.
The short version
In mice, a very fast kind of radiation held back brain tumors as well as normal radiation did.
What was studied. Researchers used young mice that had human medulloblastoma tumors in the brain. Five groups of mice got either very fast radiation, called FLASH, or normal radiation, or no radiation at all.
What they found. Both kinds of radiation held the tumor back in all the treated mice. Memory tests in the treated mice stayed as good as in healthy mice. Signs of swelling in the brain were lower after FLASH. The two kinds of radiation also turned on different genes in the brain.
What this means, and what it doesn't
What it could mean: FLASH radiation may one day be a way to treat these tumors with less harm to the brain. Right now this is early animal work. It does not change the care a patient gets today.
What it doesn't mean: This does not mean FLASH radiation is ready for patients. It was tested only in mice, not in people, so this is an early stage of research. It also did not fight the tumor better than normal radiation. It is not a cure, and it is not a promise of one. Testing in people would have to come first, and that takes years.
Source: bioRxiv (preprint), November 1, 2026 · Read the original
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