How doctors tell real tumor growth from treatment changes
Original title: Distinguishing true progression from treatment effects in glioblastoma: a practical, evidence-graded imaging framework for the multidisciplinary team.
How far along is this research?
- Lab cells
- Animals
- Review
- Tested in people
This looks across many earlier studies rather than running a new one.
This is a review of current research with a suggested plan, not a proven test or a new treatment.
The short version
After radiation and chemo, a brain scan can look worse even when the tumor is not actually growing.
What was studied. This was a review paper, not a new experiment. The authors gathered and graded published research from 2010 to 2025 on MRI scans, amino acid PET scans, and computer analysis of scan images.
What they found. Regular MRI alone cannot reliably tell the difference in 30-40% of cases. The authors report that adding an amino acid PET scan to MRI looked more accurate than regular MRI alone. But they warn those results likely look better than real life, because the studies included easy cases along with the hard ones. They also list things that shift the odds, such as how long it has been since treatment, whether symptoms are getting worse, and which drugs a person has had.
What this means, and what it doesn't
What it could mean: If your scan looks worse after treatment, that alone does not settle whether the tumor is growing. Your team may add a special MRI or a PET scan before deciding. Your symptoms and your treatment timeline matter too. This is a reason to have several kinds of specialists look at your case together.
What it doesn't mean: This is not a new treatment, and it is not a cure. It is a summary of where the science stands, plus a suggested order of tests. The authors say plainly that their framework is not a proven decision tool. It still has to be tested in new studies before anyone can call it reliable. Amino acid PET is also not available at every center in the U.S. In some cases, a tissue sample is still the only way to know for sure.
Source: PubMed, August 7, 2026 · Read the original
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