Abstract
Aim
We investigated whether tumor-specific CD8+ T-cell responses affect tumor-free survival as well as the relationship between CD8+ T-cell responses against tumor-associated antigens (TAAs) and the clinical course after tumor treatment in patients with hepatocellular carcinoma (HCC).
Methods
Twenty patients with HCC that were treated by radiofrequency ablation or trans-catheter chemo-embolization (TACE) and in whom HCC was undetectable by ultrasonography, CT, and/or MRI 1 month after treatment were enrolled in the study. Before and after treatment for HCC, analyses of TAA (glypican-3, NY-ESO-1, and MAGE-1)-specific CD8+ T-cell responses were evaluated with an interferon-γ enzyme-linked immunospot (ELISpot) assay using peripheral CD8+ T-cells, monocytes, and 104 types of 20-mer synthetic peptide overlapping by 10 residues and spanning the entirety of the 3 TAAs.
Results
Sixteen out of 20 patients (80%) showed a positive response (≥10 TAA-specific cells/105 CD8+ T-cells) before or after treatment. When we performed univariate analysis of prognostic factors for the tumor-free period in the 20 patients, platelet count, prothrombin time, and the number of TAA-specific CD8+ T-cells after treatment were significant factors (P = 0.027, 0.030, and 0.004, respectively). In multivariate analysis, the magnitude of the TAA-specific CD8+ T-cell response (≥40 TAA-specific cells/105 CD8+ T-cells) was the only significant prognostic factor for a prolonged tumor-free interval (hazard ratio 0.342, P = 0.022).
Conclusions
Our results suggest that strong TAA-specific CD8+ T-cell responses suppress the recurrence of HCC. Immunotherapy to induce TAA-specific cytotoxic T lymphocytes by means such as the use of peptide vaccines should be considered for clinical application in patients with HCC after local therapy.
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Acknowledgments
This study was supported in part by a grant from the Ministry of Health, Labor and Welfare of Japan (Kazumasa Hiroishi, Michio Imawari); a Grant-in-Aid for Scientific Research (C) from the Ministry of Education, Culture, Sports, Science and Technology of Japan (Kazumasa Hiroishi); and a grant for the High-Technology Research Center Project from the Ministry of Education, Culture, Sports, Science and Technology of Japan (Michio Imawari).
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Hiroishi, K., Eguchi, J., Baba, T. et al. Strong CD8+ T-cell responses against tumor-associated antigens prolong the recurrence-free interval after tumor treatment in patients with hepatocellular carcinoma. J Gastroenterol 45, 451–458 (2010). https://doi.org/10.1007/s00535-009-0155-2
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DOI: https://doi.org/10.1007/s00535-009-0155-2