Strong CD8(+) T-cell responses against tumor-associated antigens prolong the recurrence-free interval after tumor treatment in patients with hepatocellular carcinoma.

Journal of Gastroenterology
Kazumasa HiroishiMichio Imawari

Abstract

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). 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-gamma 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. Sixteen out of 20 patients (80%) showed a positive response (> or = 10 TAA-specific cells/10(5) 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...Continue Reading

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