Şahinli, HayriyeAkyürek, NalanYılmaz, MukaddesKandemir, OlcayOcak Duran, AyşeKulaçoğlu, SezerUçar, GökhanAcar, ElifÖzet, AhmetGümüş, MahmutÇakmak Öksüzoğlu, Ömür BernaYıldırım Özdemir, Nuriye2021-04-052021-04-052021Şahinli, H., Akyürek, N., Yılmaz, M., Kandemir, O., Ocak Duran, A., Kulaçoğlu, S. ... Yıldırım Özdemir, N. (2021). PD-L1 expression in immune cells is a favorable prognostic factor for nasopharyngeal carcinoma. Indian Journal of Cancer, 58(4), 561-566. https://dx.doi.org/10.4103/ijc.IJC_459_190019-509X1998-4774https://dx.doi.org/10.4103/ijc.IJC_459_19https://hdl.handle.net/20.500.12511/6696Background: Programmed death-ligand 1 (PD-L1) has been determined as a reliable prognostic factor for various malignancies. In this study, we aimed to determine the prognostic effect of PD-L1 expression in tumor-infiltrating immune cells (TIICs) of nasopharyngeal carcinoma (NPC) patients.Methods: Seventy patients diagnosed with non-metastatic NPC were included in the study. PD-L1 expression on immune cells was analyzed by immunohistochemical method. Patients were categorized into two groups according to the PD-L1 expression level in TIICs (level of PD-L1 staining ?5% positive vs <5% negative).Results: Median follow-up period was 34 months (range = 1 - 188). 1 and 2 years survival rate were found as 75% and 63% in PD-L1 negative TIICs group (47%), and 85% and 83% in PD-L1 positive TIICs group (53%), respectively. PD-L1 positivity in immune cells (ICs) was detected in 53% of the patients. The survival rate was found better in the PD- L1 positive group compared to the negative group (P = 0.049).Discussion: In conclusion, the survival rate was found significantly better in the PD-L1 positive TIICs group, compared to the negative group.enAttribution-NonCommercial-ShareAlike 4.0 Internationalinfo:eu-repo/semantics/openAccessNasopharyngeal CarcinomaPrognosisProgrammed Death Ligand-1Article58456156610.4103/ijc.IJC_459_19N/AQ3