Leg blood clots are linked to brain spread in breast cancer
Original title: DVT-primed neutrophils reshape the brain microenvironment to promote brain metastasis.
How far along is this research?
- Lab cells
- Animals
- Review
- Tested in people
This was done in animals, not people. Most findings at this stage never become treatments.
Most of this was done in mice, plus a look back at old patient records.
The short version
A study found that leg blood clots may help breast cancer spread to the brain.
What was studied. Researchers looked back at records from a large group of patients with breast cancer that had spread. They also gave leg blood clots to mice with a hard to treat kind of breast cancer.
What they found. In the patient records, leg clots were tied to a higher chance of the cancer reaching the brain. In mice, clots made brain spread worse, but the main tumor and lung spread did not change much. The clots changed white blood cells in the blood and pulled more of them into the brain. When those white blood cells were taken away, the clots no longer helped the brain spread.
What this means, and what it doesn't
What it could mean: Blood clots in the legs are common in people with cancer. This work suggests they may matter more than doctors thought. Your care team already works to prevent and treat clots. That care stays important.
What it doesn't mean: This does not mean a clot will cause cancer to reach your brain. Most of this work was done in mice, not people. The patient part only looked back at old records, so it cannot prove cause. No new test or treatment comes from this yet. It is not a cure, and it is not a promise of one.
Source: PubMed, September 17, 2026 · Read the original
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