CD8A and gastrointestinal stromal tumor: Previous studies have reported that IFN‐γ can induce PD‐L1 expression in GIST.35 Thus, to determine how PD‐L1 regulates CD8+ T cells, we administered IFN‐γ to the GIST‐882 cell line to induce the upregulation of PD‐L1 expression.