Stroke may create brain environment that fuels glioma growth
A study in Nature Cancer reports that stroke promotes glioma infiltration into injured brain regions and reduces survival. Researchers identified a distinct population of brain cells and immune cells that drive this effect. The work links brain injury to increased brain tumor risk, which is three to seven times higher after stroke or traumatic brain injury.
The research team examined human and mouse glioma models, finding that stroke altered the tumor microenvironment, drawing cancer cells into damaged brain regions. A newly identified cell population—tumor-associated astrocytes—showed reduced calcium activity, while tumor-associated microglia and macrophages also accumulated at the injury site. Restoring calcium signaling or removing the immune cells suppressed stroke-induced tumor progression, suggesting these pathways could be targeted therapeutically.
The study builds on epidemiological evidence that stroke or traumatic brain injury raises glioma risk three to sevenfold, depending on patient age and sex. While neuron-tumor interactions were previously known to contribute to cancer growth, this work highlights astrocytes as additional communicators with cancer cells, supporting the concept that brain injury may create conditions favorable to malignancy.
This research could eventually inform screening or preventive strategies for patients with a history of stroke or traumatic brain injury, who face a three to sevenfold elevated glioma risk. If the identified cellular pathways prove targetable, these patients might one day receive interventions aimed at reducing tumor growth. The findings may also reshape how oncologists view the tumor microenvironment, potentially leading to combination therapies that address both cancer cells and surrounding brain tissue. However, translating these preclinical findings into human treatments will require substantial further investigation.