Three ways lower grade brain tumors respond to chemotherapy
Original title: Modeling tumor volume trajectory and outcome identifies 3 distinct response classes in lower-grade IDH-mutant glioma receiving first-line chemotherapy.
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 a look back at scans from people already treated, not a test of a new treatment.
The short version
Researchers found three different patterns in how these tumors change during chemotherapy.
What was studied. Researchers looked back at records from 195 people with a lower grade brain tumor called IDH gene change: A small change in a tumor's IDH gene. It is the first thing your team looks at when naming an adult glioma, and it can affect which treatments are offered. Your pathology report says whether your tumor has it. See the glossary glioma: A tumor that starts in the glial cells. Those are the support cells of the brain and spinal cord. Gliomas are given a grade from 1 to 4. The grade says how the tumor is expected to act. See the glossary. All of them had chemotherapy as their first treatment. The team measured tumor size on 1956 MRI scans using a computer program.
What they found. The tumors fell into three groups. In 13.8% of people, the tumor started growing as soon as treatment began, and those people did worse. In 57.4%, the tumor stayed about the same size or shrank a little, and those people did better. In 28.7%, the tumor shrank at first, then grew back quickly within 2 years.
What this means, and what it doesn't
What it could mean: How a tumor changes on early scans may say something about what comes next. Over time, this kind of tracking could help a care team notice sooner when chemotherapy is not working well. It does not change the treatment choices available today.
What it doesn't mean: This is not a new treatment, and it is not a cure. The researchers looked back at old records from one hospital. They did not test a new drug or a new plan. The three groups came from a computer model, not from a test a doctor can order for you. Your own scans may not follow any of these patterns.
Source: PubMed, July 13, 2026 · Read the original
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