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Published in: Journal of Cancer Research and Clinical Oncology 10/2020

01-10-2020 | osteosarcoma | Original Article – Clinical Oncology

PD-L1 and IDO1 expression and tumor-infiltrating lymphocytes in osteosarcoma patients: comparative study of primary and metastatic lesions

Authors: Yu Toda, Kenichi Kohashi, Yuichi Yamada, Masato Yoshimoto, Shin Ishihara, Yoshihiro Ito, Takeshi Iwasaki, Hidetaka Yamamoto, Yoshihiro Matsumoto, Yasuharu Nakashima, Masaaki Mawatari, Yoshinao Oda

Published in: Journal of Cancer Research and Clinical Oncology | Issue 10/2020

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Abstract

Purpose

Programmed death ligand 1 (PD-L1) and indoleamine 2,3-dioxygenase 1 (IDO1) are immunosuppressive proteins known to be associated with poor prognosis in various cancers. However, their expression and clinical relevance in osteosarcoma remain unknown. In this study, the relationships of PD-L1 and IDO1 expression with clinicopathological features and prognosis were explored.

Methods

The expression of PD-L1, IDO1, CD3, CD4, and CD8 in 112 formalin-fixed, paraffin-embedded tumor tissues collected by biopsy or surgical resection from 56 osteosarcoma patients was evaluated immunohistochemically. Moreover, four osteosarcoma cell lines were evaluated for the effects of IFNγ on PD-L1 and IDO1 mRNA expression by real-time reverse-transcription polymerase chain reaction.

Results

In pre-neoadjuvant chemotherapy (NAC) primary specimens, 10 cases (17%) showed PD-L1 expression and 12 (21%) showed IDO1 expression. Six of ten cases (60%) with PD-L1 positivity co-expressed IDO1. In post-NAC metastatic lesions, the frequency of immunoexpression of PD-L1 and IDO1 was increased compared with that in pre-NAC specimens. PD-L1 and/or IDO1 expression was not associated with poor prognosis. PD-L1 immunoexpression was significantly associated with the infiltration of CD3+ T cells, CD4+ T cells, and CD8+ T cells; while, IDO1 immunoexpression was significantly associated with the infiltration of CD3+ T cells and CD4+ T cells. In all osteosarcoma cell lines, PD-L1 and IDO1 expression was upregulated by stimulation with IFNγ.

Conclusion

Our results suggest that the PD-L1 and IDO1 immune checkpoint inhibitors may provide clinical benefit in osteosarcoma patients with metastatic lesions after conventional chemotherapy.
Appendix
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Literature
go back to reference Dunn GP, Koebel CM, Schreiber RD (2006) Interferons, immunity and cancer immunoediting. Nat Rev Immunol 2006:836–848CrossRef Dunn GP, Koebel CM, Schreiber RD (2006) Interferons, immunity and cancer immunoediting. Nat Rev Immunol 2006:836–848CrossRef
Metadata
Title
PD-L1 and IDO1 expression and tumor-infiltrating lymphocytes in osteosarcoma patients: comparative study of primary and metastatic lesions
Authors
Yu Toda
Kenichi Kohashi
Yuichi Yamada
Masato Yoshimoto
Shin Ishihara
Yoshihiro Ito
Takeshi Iwasaki
Hidetaka Yamamoto
Yoshihiro Matsumoto
Yasuharu Nakashima
Masaaki Mawatari
Yoshinao Oda
Publication date
01-10-2020
Publisher
Springer Berlin Heidelberg
Published in
Journal of Cancer Research and Clinical Oncology / Issue 10/2020
Print ISSN: 0171-5216
Electronic ISSN: 1432-1335
DOI
https://doi.org/10.1007/s00432-020-03242-6

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