Preventing a serious lung infection in people with brain tumors
Original title: Pneumocystis jirovecii pneumonia and prophylaxis in patients with solid tumours: a narrative review.
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 advice doctors already follow, not a new result.
The short version
Some brain tumor treatments raise the risk of a rare lung infection, and doctors can give a common antibiotic to help prevent it.
What was studied. This is a review paper. The authors pulled together what is already known about a lung infection called PJP in people with solid tumors, with a close look at brain tumors and steroid use.
What they found. PJP is uncommon, but it can be deadly. In people who do not have HIV, severe cases often lead to death in 30-50% of patients. The risk is not the same for everyone. It is higher with long steroid use, with temozolomide given at the same time as radiation for high 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, with radiation to the brain and spine, and with low white blood cell counts that last. An antibiotic called trimethoprim-sulfamethoxazole is the preferred choice to prevent it.
What this means, and what it doesn't
What it could mean: If you are on steroids at 20 mg/day of prednisone, or a similar dose of another steroid, for about 4 weeks or longer, this may apply to you. It may also apply if you are getting temozolomide and radiation together. You can ask your care team if a preventive antibiotic is right for you.
What it doesn't mean: This is not a treatment for a brain tumor. It does not shrink tumors or help you live longer with cancer, and it is not a cure. It is also not a new study. It is a summary of existing research and guidance. The authors point out that evidence for adults with solid tumors is limited. No randomized prevention trial has focused only on this group, so much of the advice is borrowed from other patient groups. Prevention does not mean you cannot get the infection.
Source: PubMed, July 22, 2026 · Read the original
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