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Identification of neoepitopes recognized by tumor-infiltrating lymphocytes (TILs) from patients with glioma

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  • Davide Valentini
  • Martin Rao
  • Qingda Meng
  • Anna von Landenberg
  • Jiri Bartek
  • Georges Sinclair
  • Georgia Paraschoudi
  • Elke Jäger
  • Inti Harvey-Peredo
  • Ernest Dodoo
  • Markus Maeurer
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Neoepitope-specific T-cell responses have been shown to induce durable clinical responses in patients with advanced cancers. We explored the recognition patterns of tumor-infiltrating T lymphocytes (TILs) from patients with glioblastoma multiforme (GBM), the most fatal form of tumors of the central nervous system. Whole-genome sequencing was used for generating DNA sequences representing the entire spectrum of 'private' somatic mutations in GBM tumors from five patients, followed by 15-mer peptide prediction and subsequent peptide synthesis. For each mutated peptide sequence, the wildtype sequence was also synthesized and individually co-cultured with autologous GBM TILs, which had been expanded in vitro with a combination of interleukin (IL)-2, IL-15 and IL-21. After seven days of culture, interferon gamma (IFN-γ), tumor necrosis factor alpha (TNF-α) and/or IL-17A production was measured by ELISA in culture supernatants, and used as an epitope-specific immune response readout. Mutated peptides that induced a strong cytokine response were considered to contain legitimate neoepitopes. TILs from 5/5 patients with GBM exhibited specific immune reactivity profiles to the nominal target peptides, defined by IFN-γ and/or TNF-α production, as well as IL-17A. Neoepitopes, defined by mutated peptides inducing IFN-γ and/or TNF-α production without or only minimal reactivity to the wildtype sequences, were found for each individual patient. CD8+ TILs dominated the patients' responses to private neoepitopes. The present study shows that neoepitope-specific TIL reactivity constitutes an important arm of anti-tumor immune responses in patients with GBM, and thus a powerful tool for developing next-generation personalized immunotherapies.

Original languageEnglish
JournalOncotarget
Volume9
Issue number28
Pages (from-to)19469-19480
Number of pages12
ISSN1949-2553
DOIs
Publication statusPublished - 13 Apr 2018

ID: 55800548