CD274 and nasopharyngeal carcinoma: However, sPD-L1 level was not associated with LMP1 expression score (p = 0.49, r = 0.13), PD-L1 TPS (p = 0.92, r = 0.02), and PD-L1 CPS (p = 0.88, r = 0.03) in patients with NPC.