Expression of programmed cell death ligand 1 (PD-L1) in advanced stage EBV-associated extranodal NK/T cell lymphoma is associated with better prognosis

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• 作者：Wook Youn Kim ; Ho Young Jung ; Soo Jeong Nam ; Tae Min Kim ; Dae Seog Heo…
• 关键词：Programmed cell death 1 ; Programmed cell death ligand 1 ; Prognosis ; Extranodal NK/T cell lymphoma ; EBV
• 刊名：Virchows Archiv
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：469
• 期：5
• 页码：581-590
• 全文大小：838 KB
• 刊物类别：Medicine
• 刊物主题：Medicine & Public Health
  Pathology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-2307
• 卷排序：469

文摘

Programmed cell death 1 (PD-1)/PD-1 ligand 1 (PD-L1) pathway blockade has emerged as a promising strategy for cancer therapy. Extranodal natural killer/T cell lymphoma (ENKTL) is an aggressive disease characterized by a strong association with Epstein–Barr virus (EBV), and chronic EBV infection is known to induce PD-L1 expression. However, the PD-1/PD-L1 pathway status in ENKTL remains elusive. Thus, the expression pattern of PD-1 and PD-L1 was investigated in 73 ENKTL cases, and its clinicopathological features and prognostic significance were analyzed. Most ENKTLs had few PD-1+ lymphocytes in the tumor microenvironment. PD-L1 was positive in 56 % (n = 41/73) with a cutoff value of ≥10 % of tumor cells and in 62 % (n = 45/73) with a cutoff value of ≥10 % of total cells including malignant and non-malignant cells. PD-L1 expression on tumor cells was mostly correlated with PD-L1 expression on non-malignant cells. PD-L1 positivity showed no significant relationship with clinicopathological features. However, patients with PD-L1+ ENKTL exhibited better 5-year overall survival (OS) and a trend for longer 5-year progression-free survival. Moreover, in the subgroups with clinically advanced parameters including late stage III/IV, higher International Prognostic Index scores of 2–5 or non-upper aerodigestive tract involvement PD-L1 positivity was also associated with favorable OS. PD-L1 expression was the only significant independent predictor for longer OS in patients with advanced stage (III/IV) ENKTL. These results suggest that PD-L1 might be used as a novel prognostic marker.