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

  • Original Article – Clinical Oncology
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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.

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Abbreviations

PD-L1:

Programmed death ligand 1

IDO1:

Indoleamine 2,3-dioxygenase 1

NAC:

Neoadjuvant chemotherapy

TIL:

Tumor-infiltrating lymphocyte

MTX:

Methotrexate

CDDP:

Cisplatin

ADR:

Adriamycin

OS:

Overall survival

EFS:

Event-free survival

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Authors and Affiliations

Authors

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Correspondence to Yoshinao Oda.

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Conflict of interest

All authors declare that they have no conflicts of interest.

Ethical approval

The institutional review board at Kyushu University approved this study (approval codes: 29-625, 29-429).

Informed consent

Informed consent was obtained from all participants included in this study.

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Supplementary file2 (XLSX 10 kb)

432_2020_3242_MOESM3_ESM.pptx

Supplementary Figure. S1. The flow chart of patients selection of process. We excluded parosteal osteosarcoma, extraskeletal osteosarcoma and low-grade central osteosarcoma. We performed immunohistochemical study and examined antigenicity by evaluating immunoexpression of endogenous control (CD3, CD4 and CD8) and contrasting with HE stain. 56 cases 99 tumors including, primary pre-NAC specimens (56 tumors), primary post-NAC specimens (11 tumors), metastatic specimens (31 tumors) and recurrence specimen (one tumor) were evaluable. Supplementary Figure. S2. Double-staining for interferon-gamma (red: arrow) and tumor-infiltrating lymphocytes (brown), CD3, CD4 and CD8. Scale bars shown 20μl (PPTX 433 kb)

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Toda, Y., Kohashi, K., Yamada, Y. et al. PD-L1 and IDO1 expression and tumor-infiltrating lymphocytes in osteosarcoma patients: comparative study of primary and metastatic lesions. J Cancer Res Clin Oncol 146, 2607–2620 (2020). https://doi.org/10.1007/s00432-020-03242-6

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  • DOI: https://doi.org/10.1007/s00432-020-03242-6

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