Glioblastoma is one of the most difficult cancers to treat, largely because therapies struggle to penetrate the brain without harming healthy tissue.
A research team from Washington University School of Medicine, working with scientists at Northwestern University, has taken a different approach: delivering immune-stimulating nanodrops through the nose rather than through surgery or systemic treatment.
How the experimental nanodrops work
Instead of targeting tumours directly with toxic drugs, the researchers created tiny spherical nucleic acid structures built on a gold core.
These particles carry molecules designed to activate the body’s cGAS–STING pathway — an internal alarm system that alerts immune cells when tissue begins to behave abnormally.
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By sending the nanodrops through the nasal passages, the team was able to guide them along nerve pathways that provide access to the brain.
According to the research, published in PNAS, the particles accumulated in and around tumour tissue, where they triggered a stronger immune reaction against cancer cells.
Results seen in mice
When tested in mouse models of glioblastoma, the nasal treatment produced a highly targeted immune response.
In some experiments, the researchers paired the nanodrops with T-cell-activating drugs, and the combination halted tumour growth far more effectively than either treatment alone. Several mice cleared their tumours entirely and showed lasting immune protection against recurrence.
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What comes next
The scientists behind the work say the findings demonstrate a possible path toward noninvasive brain-cancer immunotherapy, though they emphasise that the results are still early.
Further animal studies are planned to refine the nanostructures and evaluate dosing, safety and durability before any human trials can be considered.
If future research confirms these early outcomes, nasal delivery could offer a new way to reach cancers that have long resisted conventional treatment.
Sources: PNAS and ScienceDaily
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