A brain scan measure of oxygen use mostly reflects blood flow
Original title: Blood flow rather than oxygen extraction accounts for a size-dependent capillary-function DSC-MRI oxygen-metabolism contrast in glioblastoma
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 a look back at scans already taken from people, not a treatment.
The short version
One MRI measure that looks like it shows oxygen use is mostly showing blood flow.
What was studied. Researchers looked back at MRI scans from people with untreated glioblastoma: The fastest-growing type of glioma (grade 4). Treatment usually starts soon after diagnosis: surgery first, then radiation and chemotherapy. See the glossary at one center. Of 131 patients, 122 could be studied. They checked what really drives an MRI measure of how the brain uses oxygen.
What they found. The measure was compared between the glowing tumor area and the brain right around it. About 92.6% of that difference came from blood flow. Only about 6.6% came from oxygen being pulled out of the blood. The flow share also shifted with tumor size. It went from 67.8% up to 104.0% across size groups.
What this means, and what it doesn't
What it could mean: This scan number should not be read by itself. Doctors should read it along with the other blood flow maps from the same scan. On its own, it does not prove how a tumor uses oxygen.
What it doesn't mean: This is not a treatment and it is not a cure. It does not change the care anyone gets today. The team looked back at old scans at a single center. It points out a limit in how one scan number is read. It is not a new way to treat brain tumors, and it is not a promise of one.
Source: medRxiv (preprint), August 17, 2026 · Read the original
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