Gut germs look different in people with glioblastoma
Original title: Exploring the gut-brain axis in glioblastoma: a prospective case-control study of the gut bacteriome and mycobiome
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 only compared samples from people. No treatment was tested.
The short version
People with glioblastoma: A glioma that is given grade 4, the highest grade. It grows fast. Treatment usually starts soon after it is found. It often means surgery, then radiation and chemotherapy. See the glossary had a different mix of gut germs than healthy people.
What was studied. Doctors tested gut samples from 23 people with new glioblastoma: A glioma that is given grade 4, the highest grade. It grows fast. Treatment usually starts soon after it is found. It often means surgery, then radiation and chemotherapy. See the glossary and from 23 healthy people. They checked both bacteria and fungi. They also looked at immune cells inside the tumors.
What they found. The mix of gut germs was more varied in patients than in healthy people. Fourteen of 218 bacteria types and four of 102 fungus types differed between the groups. Inside the tumor, having more of one kind of immune cell went along with living longer.
What this means, and what it doesn't
What it could mean: The gut may be tied in some way to this brain tumor. For now this changes nothing about your care. There is no diet, pill, or germ test here to ask your doctor for.
What it doesn't mean: This does not mean gut germs cause glioblastoma: A glioma that is given grade 4, the highest grade. It grows fast. Treatment usually starts soon after it is found. It often means surgery, then radiation and chemotherapy. See the glossary, or that changing them would help. It was a first look at two small groups, not a test of any treatment. The study cannot tell cause from coincidence. It is a long way from everyday care, and it is not a cure.
Source: medRxiv (preprint), September 24, 2026 · Read the original
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