Abstract
We have previously revealed the overexpression of Wilms’ tumor gene 1 (WT1) in malignant glioma and developed WT1 peptide vaccine cancer immunotherapy. A phase II clinical trial indicated the clinical efficacy of the WT1 peptide vaccine for recurrent malignant glioma. Here, we aimed to investigate the immunological microenvironment in glioma tissues before and after WT1 peptide vaccine treatment. Paired tissue samples were obtained from 20 malignant glioma patients who had received the WT1 peptide vaccine for > 3 months and experienced tumor progression, confirmed radiographically and/or clinically, during vaccination. We discovered that the expression of WT1 and HLA class I antigens in the tumor cells significantly decreased after vaccination. Maintenance of WT1 expression, which is the target molecule of immunotherapy, in tumor cells during the vaccination period was significantly associated with a longer progression-free and overall survival. A high expression of HLA class I antigens and low CD4+/CD8+ tumor-infiltrating lymphocytes (TIL) ratio in pre-vaccination specimens, were also associated with a good prognosis. No statistically significant difference existed in the number of infiltrating CD3+ or CD8+ T cells between the pre- and post-vaccination specimens, whereas the number of infiltrating CD4+ T cells significantly decreased in the post-vaccination specimens. This study provides insight into the mechanisms of intra-tumoral immune reaction/escape during WT1 peptide vaccine treatment and suggests potential clinical strategies for cancer immunotherapy.
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Abbreviations
- AA:
-
Anaplastic astrocytoma
- AE:
-
Anaplastic ependymoma
- AOA:
-
Anaplastic oligoastrocytoma
- CI:
-
Confidence intervals
- CR:
-
Complete response
- CTL:
-
Cytotoxic T lymphocyte
- GBM:
-
Glioblastoma
- HLA:
-
Human leukocyte antigen
- HR:
-
Hazard ratio
- IL:
-
Interleukin
- OS-WT1:
-
Overall survival from the start of the WT1 vaccination
- PD:
-
Progressive disease
- PD-1:
-
Programmed cell death-1
- PD-L1:
-
Programmed cell death ligand-1
- PFS-WT1:
-
Progression-free survival from the start of the WT1 vaccination
- PR:
-
Partial response
- SD:
-
Stable disease
- TAA:
-
Tumor-associated antigen
- TGF:
-
Transforming Growth Factor
- TIL:
-
Tumor-infiltrating lymphocytes
- Treg:
-
Regulatory T cell
- TRM:
-
Tissue-resident memory T cell
- TSA:
-
Tumor-specific antigen
- WHO:
-
World Health Organization
- WT1:
-
Wilms’ tumor gene 1
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Acknowledgements
We would like to thank all the patients enrolled in our clinical trials and the Center for Medical Research and Education, Graduate School of Medicine, Osaka University, for their support.
Funding
This work was supported by JSPS KAKENHI Grant Numbers JP 16K20008 and JP 25462257.
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CY, KT, YC, NK, and NH participated in the conception and design of this study. CY, KT, and YC performed the experiments. NK, AT, YO, YO, SI, HS and NH contributed to patient recruitment, treatment, and clinical data collection. CY, KT, YC, and YO contributed to the statistical analyses. MK, NK, AT, YO, HS, HK, NH, and NK joined the discussion, following which, CY, KT, YO, NH, and NK collectively wrote the manuscript. All authors had contributed towards manuscript revisions and have approved the final manuscript.
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The study was performed in accordance with the Declaration of Helsinki, Japanese Ethical Guidelines for Clinical Research, and Japanese Guidelines for Medical and Health Research. This trial was registered at the UMIN Clinical Trials Registry as Umin000000933 and Umin000002001. This clinical study was approved by the Ethical Review Board of Osaka University (approval number 07099 and 18193).
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Yokota, C., Kagawa, N., Takano, K. et al. Maintenance of WT1 expression in tumor cells is associated with a good prognosis in malignant glioma patients treated with WT1 peptide vaccine immunotherapy. Cancer Immunol Immunother 71, 189–201 (2022). https://doi.org/10.1007/s00262-021-02954-z
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DOI: https://doi.org/10.1007/s00262-021-02954-z