Bleeding in the brain with targeted cancer drugs
Original title: Intratumoral and intracranial hemorrhage associated with MAPK-pathway targeted therapy: a systematic review and mechanistic synthesis.
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 already done, about medicines doctors already use.
The short version
Some targeted cancer drugs can cause bleeding in the brain or inside the tumor, and this review looked at how often that happens.
What was studied. Researchers gathered the studies done so far on drugs that block the MAPK pathway, such as BRAF and MEK inhibitors. They searched medical databases up to May 2026 and also read FDA drug labels.
What they found. In a trial of tovorafenib for children with low grade glioma: A tumor that starts in the glial cells, the support cells of the brain and spinal cord. Gliomas are graded 1 to 4 by how fast they tend to grow. See the glossary, 137 patients took part. Bleeding of any kind happened in 42% of them. Serious bleeding happened in 7 patients (5%), and one child died from bleeding inside the tumor. In the FDA safety group of 140 patients, bleeding inside the tumor was reported in 9%. With dabrafenib for melanoma that had spread to the brain, brain bleeding happened in 6% in one trial, and a deadly bleed happened in 0.8% in another. Adding a BRAF drug to focused radiation was tied to about 3 times higher chance of brain bleeding than radiation alone.
What this means, and what it doesn't
What it could mean: These drugs are already used, and this review does not say to stop them. It does say bleeding is a real safety concern that doctors should watch for. If you or your child takes one of these drugs, you can ask your care team how they check for bleeding. You can also ask what it means if focused radiation is planned at the same time.
What it doesn't mean: This does not mean these drugs are unsafe for everyone, and it is not a reason to stop treatment on your own. It is not a new treatment, and it is not a cure. It is also not a new study in people. It is a summary of studies already done. The authors say the true rate of bleeding is still not clear, because studies used different rules and different ways of looking for it.
Source: PubMed, July 15, 2026 · Read the original
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