Brain tumors that grow back after radiation have fewer immune cells
Original title: Immune remodelling and molecular profiling of progressive brain metastases following cranial radiotherapy.
How far along is this research?
- Lab cells
- Animals
- Review
- Tested in people
This was tested in people. That is the most reliable kind of research we share.
This was a look at tumor tissue from people, not a test of a new treatment.
The short version
Brain tumors that kept growing after brain radiation had fewer immune cells that fight cancer.
What was studied. Doctors studied tumor tissue from 153 people with brain tumors that spread from another cancer. They compared 43 people who had brain radiation first. The other group was 63 people who had no treatment first.
What they found. Tumors from the 43 people who had radiation had fewer of the immune cells that attack cancer. They also had more of the immune cells that calm an attack down. The team found no changes in the tumors' genes or gene settings.
What this means, and what it doesn't
What it could mean: Radiation may leave the area around the tumor with a weaker immune defense. That could matter for drugs that work by waking up the immune system. Doctors do not know yet how to use this finding.
What it doesn't mean: This does not mean radiation stops working or should be skipped. It is not a new treatment, and it is not a cure. The team looked at tissue taken during surgery. They did not test any drug in a trial. It does not change care today. The authors say more studies are needed.
Source: PubMed, August 13, 2026 · Read the original
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