Focused ultrasound changed the size of tiny particles in the blood, not the amount
Original title: FUS-mediated BBB opening reshapes plasma extracellular vesicle size distribution without elevating concentration in glioblastoma patients.
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 measured in a small group of people, and it is a research question about blood tests, not a treatment you can get.
The short version
Opening the brain's protective barrier with sound waves did not push more tumor material into the blood, but it did change the size of tiny particles there.
What was studied. Doctors did 14 MRI-guided focused ultrasound procedures in people 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. Focused ultrasound briefly opens the blood-brain barrier. Blood was taken 1 hour before and 1 hour after each procedure and checked for tiny particles released by cells and for free-floating DNA.
What they found. The amount of tiny particles did not change in any steady way. It varied a lot from patient to patient and from procedure to procedure. The size of the particles did shift in a repeatable way, getting smaller by about 8 to 10 nanometers, mostly because the largest ones dropped off. Free-floating DNA also varied, and it went up in some patients only.
What this means, and what it doesn't
What it could mean: This does not change your care today. It is a study of what shows up in blood after the procedure. It suggests that opening the barrier may not be needed to find these tiny particles in blood, because they seem able to cross the barrier on their own. That still supports using blood tests to learn about brain tumors.
What it doesn't mean: This is not a treatment and it is not a cure. It was an early study in a small group, only 14 procedures. It does not show that focused ultrasound helps people live longer or feel better. It does not mean a blood test for brain tumors is ready for you. The authors say more work is needed before this changes how doctors use these scans and tests.
Source: PubMed, July 14, 2026 · Read the original
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