Abstract
Nasal natural killer/T-cell lymphoma (NNKTL) is an aggressive neoplasm with poor therapeutic responses and prognosis. The programmed death-1/programmed death-ligand 1 (PD-1/PD-L1) pathway plays an important role in immune evasion of tumor cells through T-cell exhaustion. The aim of the present study was to examine the expression of PD-L1 and PD-1 molecules in NNKTL. We detected the expression of PD-L1 in biopsy samples from all of the NNKTL patients studied. PD-L1 was found on both malignant cells and tumor-infiltrating macrophages, while PD-1-positive mononuclear cells infiltrated the tumor tissues in 36% of patients. Most significantly, soluble PD-L1 (sPD-L1) was present in sera of NNKTL patients at higher levels as compared to healthy individuals and the levels of serum sPD-L1 in patients positively correlated with the expression of PD-L1 in lymphoma cells of tumor tissues. In addition, the high-sPD-L1 group of patients showed significantly worse prognosis than the low-sPD-L1 group. Furthermore, we confirmed that membrane and soluble PD-L1 was expressed on the surface and in the culture supernatant, respectively, of NNKTL cell lines. The expression of PD-L1 was observed in tumor tissues and sera from a murine xenograft model inoculated with an NNKTL cell line. Our results suggest that sPD-L1 could be a prognostic predictor for NNKTL and open up the possibility of immunotherapy of this lymphoma using PD-1/PD-L1 axis inhibitors.
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Abbreviations
- CAEBV:
-
Chronic active Epstein–Barr virus infection
- CTLs:
-
Cytotoxic T lymphocytes
- EBER:
-
Epstein–Barr virus encoded small RNA
- EBV:
-
Epstein–Barr virus
- FBS:
-
Fetal bovine serum
- FFPE:
-
Formalin-fixed, paraffin-embedded
- IFN:
-
Interferon
- IL:
-
Interleukin
- IPI:
-
International Prognostic Index
- ISH:
-
In situ hybridization
- LDH:
-
Lactate dehydrogenase
- LMP:
-
Latent membrane protein
- mAbs:
-
Monoclonal antibodies
- NK:
-
Natural killer
- NNKTL:
-
Nasal natural killer/T-cell lymphoma
- OS:
-
Overall survival
- PD-1:
-
Programmed death-1
- PD-L1:
-
Programmed death-ligand 1
- PINK:
-
Prognostic index of natural killer lymphoma
- ROC:
-
Receiver-operating characteristic
- RT:
-
Room temperature
- sPD-L1:
-
Soluble programmed death-ligand 1
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Acknowledgements
The authors thank Dr. Norio Shimizu (Tokyo Medical and Dental University) for generously providing cell lines, Mr. Toshiyuki Hayakawa (Animal Laboratory for Medical Research, Center for Advanced Research and Education, Asahikawa Medical University) for devotedly maintaining mice, and Ms. Rie Matsumoto (Department of Pathology, Asahikawa Medical University) and Ms. Keiko Nishikura (Department of Dermatology, Asahikawa Medical University) for technical assistance. This study was supported by the Japan Society for the Promotion of Science (JSPS) KAKENHI [Grant Numbers 15K20172 (Nagato T), 26462576 (Kishibe K), 15H04986 (Harabuchi Y), and 16K15244 (Kobayashi H)].
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Nagato, T., Ohkuri, T., Ohara, K. et al. Programmed death-ligand 1 and its soluble form are highly expressed in nasal natural killer/T-cell lymphoma: a potential rationale for immunotherapy. Cancer Immunol Immunother 66, 877–890 (2017). https://doi.org/10.1007/s00262-017-1987-x
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DOI: https://doi.org/10.1007/s00262-017-1987-x