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Volume 2 Supplement 3

Abstracts of the 29th Annual Scientific Meeting of the Society for Immunotherapy of Cancer (SITC)

A fast assay to gauge for TAA-reactive T cells in PBMCS from patients with pancreatic cancer

Purpose

Active cellular therapy (ACT) using ex-vivo expanded T cells from patients with cancer, obtained by apheresis, can represent a viable source for anti-cancer directed cellular therapy. We established a T cell expansion protocol using 2 rounds of re-stimulation with TAA peptides along with IL-2, IL-15 and IL-21. In order to gauge the ex-vivo cellular reactivity as well as the potential to successful expand antigen-specific T cells from patients with pancreatic cancer, we established a screening assay using whole-heparin blood, to gauge for TAA reactivity (NY-ESO-1, survivin and mesothelin) and control antigens (EBNA-1, EBNA-3, CMVpp65).

Methods

Fresh blood samples were obtained from 24 patients with pancreatic cancer and from 6 individuals with pre-malignant lesions and tested for anti-TAA reactivity. T cells were expanded without cytokines, with IL-2 and IL-7, or with IL-2, IL-15 and IL-21 and tested for CD4/8 expansion by flow cytometry and for IFN-gamma production. PBMCs were expanded by cytokines and TAA peptides. CD3, CD4, CD8, CD45RA and CCR7 was determined by flow cytometry and TAA-reactive T cells were identified by ICS (IL-2, TNF, IFN and IL-17).

Results

We could detect IFN-gamma responses in 90% (27 in 30) in blood samples for mesothelin, 55,3% (16 in 30) for survivin and 43,3% (13 in 30) for NY-ESO-1. Cellular responses could be augmented by adding cytokines, i.e. IL-2 and IL-7 could favored CD4+ T cell proliferation, IL-2, IL-15 and IL-21 favored CD8+ T cell proliferation. TAAs-reactive T cells could be successfully expanded in vitro and exhibited TAA-specific production of IFNgamma and TNFalpha and a CD8+CD45RA-CCR7+ phenotype.

Conclusion

A TAA-specific WBA (whole blood assay) can be used to gauge the potential for expansion of TAA-reactive T cells in peripheral blood from patients with pancreatic cancer. TAA-reactive T cells can be successfully expanded in IL-2, IL-15 and IL-21 and could represent a viable source for the cellular therapy of patients with pancreatic cancer.

Consent

Written informed consent was obtained from the patient for publication of this abstract and any accompanying images. A copy of the written consent is available for review by the Editor of this journal.

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Correspondence to Markus Maeurer.

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Rangelova, E.B., Meng, Q., zhenjiang, L. et al. A fast assay to gauge for TAA-reactive T cells in PBMCS from patients with pancreatic cancer. j. immunotherapy cancer 2, P25 (2014). https://doi.org/10.1186/2051-1426-2-S3-P25

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Keywords

  • Cell Proliferation
  • Blood Sample
  • Flow Cytometry
  • Pancreatic Cancer
  • Cellular Response