Two lab tests did not always agree on tumor type
Original title: Comparative Evaluation of Immunohistochemistry With DNA Methylation Profiling for Molecular Classification of Medulloblastomas: A Single-Institution Cohort Study.
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 looked back at tumor samples from one hospital, not a new treatment.
The short version
A stain test and a DNA test gave different answers for some brain tumors.
What was studied. Doctors studied 44 brain tumors called medulloblastoma. Each tumor was sorted into a type two ways, with a stain test and with a DNA test.
What they found. The DNA test gave a clear tumor type in 31 of the 44 tumors. In 1 tumor, the DNA test could not tell two of the types apart. The two tests disagreed in 7 cases. The stain test called those 7 one type, but the DNA test showed a different type.
What this means, and what it doesn't
What it could mean: The tumor type helps doctors know what to expect and what to plan. This study suggests the stain test alone can point to the wrong type. A DNA test can help check that answer.
What it doesn't mean: This is not a new treatment, and it is not a cure or a promise of one. It was one hospital looking back at 44 tumor samples. It does not mean the stain test is always wrong. Both tests are already part of how some labs work today. If you have questions, ask your care team which tests they used.
Source: PubMed, September 30, 2026 · Read the original
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