Blocking a tumor signal may help CAR T cells fight brain tumors
Original title: Therapeutic Targeting of the TGFβ Pathway Augments CAR T cell Efficacy in Glioblastoma
How far along is this research?
This is a preprint. Other scientists have not checked it yet, so treat it as an early signal rather than an answer.
The new part of this idea was only tested in mice.
The short version
Turning down one signal in the tumor may help a new immune treatment work better.
What was studied. Researchers studied fluid and tumor tissue from people in an early trial of CAR T cells for fast growing brain tumors. They also tested blocking a tumor signal called TGF beta in mice with brain tumors.
What they found. People with lower TGF beta before CAR T treatment responded better to it. TGF beta levels in the tumor fluid dropped after CAR T treatment. In mice, blocking TGF beta helped the CAR T cells grow and fight the tumor better.
What this means, and what it doesn't
What it could mean: This gives a possible reason why CAR T helps some people more than others. It could lead to future trials that add a TGF beta blocker to CAR T therapy.
What it doesn't mean: This does not mean a new treatment is ready. The part that blocks TGF beta was tested only in mice and in the lab. The human part shows a link, not proof. It is not a cure, and it is not something a doctor can offer today.
Source: bioRxiv (preprint), October 28, 2026 · Read the original
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