Where glioblastoma tumors tend to come back after treatment
Original title: Spatial patterns of progression in reported glioblastoma cohorts after upfront chemoradiation and salvage therapy: a systematic review and meta-analysis.
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 summary of studies that were already done, not a new treatment you can get.
The short version
In most reported cases, glioblastoma: The fastest-growing type of glioma (grade 4). Treatment usually starts soon after diagnosis: surgery first, then radiation and chemotherapy. See the glossary came back in or near the same spot that was treated.
What was studied. Researchers gathered 107 published studies covering 10,529 patients 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. They looked at where the tumor showed up again on scans after standard radiation with the drug temozolomide, and again after later salvage treatment.
What they found. After the first round of treatment, the tumor came back in or at the edge of the treated area in 79.2% of the cases that could be checked. It came back away from the treated area in 16.9%. After salvage treatment, the treated area was still the most common spot at 59.8%, and 17.5% came back away from it.
What this means, and what it doesn't
What it could mean: Where a tumor is likely to return matters when doctors plan more local treatment, like another round of focused radiation. These numbers suggest the area already treated is the most likely place for regrowth in most people. That can help a care team decide where to aim next.
What it doesn't mean: This does not mean there is a new treatment. It is a review of studies that were already published, not a new trial in people. The studies described tumor locations in different ways, and their results varied a lot, so the numbers are rough. It cannot tell you where your own tumor will come back. It is not a promise of a cure.
Source: PubMed, July 30, 2026 · Read the original
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