Metformin changed immune cells in mice with brain tumors
Original title: Metformin modulates the phenotypes of tumor-associated macrophages in glioblastoma in a context-dependent manner by promoting the homeostasis of macrophages.
How far along is this research?
- Lab cells
- Animals
- Review
- Tested in people
This was done in animals, not people. Most findings at this stage never become treatments.
This was only done in lab dishes and in mice.
The short version
In mice, metformin given with radiation helped them live longer.
What was studied. Researchers tested metformin on immune cells called macrophages in the lab. They then gave metformin along with radiation to mice with glioblastoma: The fastest-growing type of glioma (grade 4). Treatment usually starts soon after diagnosis: surgery first, then radiation and chemotherapy. See the glossary, a serious brain cancer.
What they found. In the lab, metformin calmed immune cells that had been pushed hard in either direction. It pushed back against the state that helps a tumor hide from the immune system. In mice, metformin plus radiation helped them live longer and left smaller tumors. More cancer fighting T cells moved into the tumor and into the blood.
What this means, and what it doesn't
What it could mean: Metformin may help radiation work better by changing the immune cells around a brain tumor. For now this is an early idea. It has been tested in dishes and in mice, not in people.
What it doesn't mean: This does not mean metformin treats brain tumors in people. Nothing here was tested in patients, so we do not know if it is safe or helpful for them. It is not a cure and it is not a promise. Many things that work in mice do not work in people. Do not start or change any medicine on your own. Talk with your care team first.
Source: PubMed, August 14, 2026 · Read the original
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