Abstract
Background
Glioblastomas (GBMs) in patients harboring somatic or germinal mutations of mismatch-repair (MMR) genes exhibit a hypermutable phenotype. Here, we describe a GBM patient with increased tumor mutational burden and germline MMR mutations, treated using anti-PD1 therapy.
Methods
A woman with newly diagnosed GBM (nGBM) was treated by surgery, radiotherapy, and temozolomide. The tumor recurred after 13 months leading to a second surgery and treatment with nivolumab. Whole-exome sequencing was performed on the nGBM, recurrent GBM (rGBM), and blood. Immune infiltration was investigated by immunohistochemistry and the immune response in the blood during treatment was analyzed by flow cytometry.
Results
High density of infiltrating CD163 + cells was found in both GBM specimens. Large numbers of CD3 + and CD8 + T cells were homogeneously distributed in the nGBM. The infiltration of CD4 + T cells and a different CD8 + T cell density were observed in the rGBM. Both GBM shared 12,431 somatic mutations, with 113 substitutions specific to the nGBM and 1,683 specific to the rGBM. Germline variants included pathogenic mutation in the MSH2 (R359S) gene, suggesting the diagnosis of Lynch syndrome. Systemic immunophenotyping revealed the generation of CD8 + T memory cells and persistent activation of CD4 + T cells. The patient is still receiving nivolumab 68 months after the second surgery.
Conclusions
Our observations indicate that the hypermutator phenotype associated with germinal mutations of MMR genes and abundant T-cell infiltration contributes to a durable clinical benefit sustained by a persistent and robust immune response during anti-PD1 therapy.
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Data availability
All data generated or analyzed during this study are included in this published article and its supplementary information files.
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Acknowledgements
We thank Silvia Musio for collaborating in flow cytometry acquisitions, Massimo Costanza for critical reading and suggestions, the staff of the SOL Group Spa-Italy for the cryo-management service and the technical assistance, and Sara Murrone for graphic support. The manuscript was edited by American Journal Experts (AJE).
Funding
The study was supported by funds provided by no-profit associations, such as Brancatelli ONLUS, il Fondo di Gio ONLUS, and donations of patient families for the development of immunotherapy strategies based on the project entitled: “Immunotherapy in preclinical models of glioma”.
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Patient recruitment, treatment, and follow-up were performed by EA with the support of ME. Histological analysis and interpretations were performed by MP and BP. Analysis and quantification of the immune infiltrates and preparation of Figs. 2 and 3 were performed by NDI. Genetic data were generated by RP and TL. JZ and RR contributed to analysis of WES data and manuscript writing. Radiological studies were performed by VC. AI contributed to data interpretation. Supervision of the study and was contributed by GF. Immune monitoring data and interpretations were performed by SP. EA, GF and SP co-wrote the manuscript. All authors have critically reviewed and approved the final manuscript.
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Anghileri, E., Di Ianni, N., Paterra, R. et al. High tumor mutational burden and T-cell activation are associated with long-term response to anti-PD1 therapy in Lynch syndrome recurrent glioblastoma patient. Cancer Immunol Immunother 70, 831–842 (2021). https://doi.org/10.1007/s00262-020-02769-4
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DOI: https://doi.org/10.1007/s00262-020-02769-4