Tumors that elude infiltration by CD8+ T lymphocytes are particularly resistant to multiple forms of treatment, including immune checkpoint blockade. Stromal transforming growth factor (TGF)-β appears to play a key role in this process, potentially constituting a target for novel combinatorial regimens tackling immune-excluded neoplasms.
Keywords: PD-1; atezolizumab; microsatellite instability; mutational burden; tumor neoantigens; tumor organoids.
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