In addition, we found that BRD7 down-regulated PD-L1 expression and enhanced the killing function of CD8+ T lymphocytes in NPC cells through binding to p85α via the 485-651 domain and inhibiting the activity of PI3K, thereby inhibiting the activity of PI3K/AKT/mTOR/STAT3 pathway. The gene discussed is CD8A; the disease is nasopharyngeal carcinoma.