Abstract

PD1 is an inhibitory receptor exposed on the surface of T cells and other immune cells. In non-small cell lung cancer and melanoma P, as well as after stem cell transplantation, higher levels of CD4+ T cells (TCD4) expressing PD1 (PD1+) correlated with poor survival outcomes. Nonetheless, in vitro PD1 blockade enhanced antitumor immunity. Finally, subpopulations of TCD4 with higher or lower PD1+ levels were identified and associated with differential functional effects and prognosis in follicular lymphoma.

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