Abstract
It remains unclear whether Helicobacter pylori (H. pylori), a major cause of gastric cancer (GC), is involved in other intestinal cancers. In our previous study, ICOS+ Foxp3+ CD4+ T cells (ICOS+ Tregs) in GC tumors were identified as effector Tregs and associated with H. pylori. In the present study, the impact of ICOS+ Tregs on not only GC, but also colorectal cancer (CRC) and their prognosis was investigated in association with H. pylori. Tissue-infiltrating lymphocytes (TILs) purified from fresh tumor and sera were obtained from GC and CRC patients prospectively. % ICOS+ Tregs were analyzed by flow cytometry and their production of anti-H. pylori antibody (Hp-Ab) in sera was detected by ELISA. % ICOS+ Tregs were higher in GC and CRC patients with Hp-Ab than in those without Hp-Ab, including eradicated patients. ICOS+ Tregs purified had higher potential to produce IL-10 than ICOS− Tregs. For prognostic analysis, immunohistochemical analysis and ELISA were performed using archival fixed specimens and frozen sera, respectively, obtained from GC and CRC patients. Overall survival was longer in patients with low % ICOS+ Tregs than in those with high % ICOS+ Tregs, and patients with Hp-Ab showed shorter recurrence-free survival than those without Hp-Ab. These results suggested that ICOS+ Tregs in GC and CRC patients were closely associated with H. pylori in gastric epithelium and their prognosis, and that pre-operative H. pylori eradication has potential as a novel immunotherapy for GC and CRC patients.
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Abbreviations
- CI:
-
Confidence interval
- CRC:
-
Colorectal cancer
- CT:
-
Cancer/testis
- eTregs:
-
Effector Tregs
- EC:
-
Esophageal cancer
- GC:
-
Gastric cancer
- HR:
-
Hazard ratio
- H. pylori, Hp :
-
Helicobacter pylori
- Hp-Ab:
-
H. pylori Antibody
- IHC:
-
Immunohistochemistry
- OC:
-
Ovarian cancer
- OS:
-
Overall survival
- PBMCs:
-
Peripheral blood mononuclear cells
- pDC:
-
Plasmacytoid dendritic cell
- RCC:
-
Renal cell carcinoma
- RFS:
-
Recurrence-free survival
- TILs:
-
Tumor tissue-infiltrating lymphocytes
- TLRs:
-
Toll-like receptors
- Tregs:
-
Regulatory T cell
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Acknowledgements
We thank all the patients who contributed to this study. We thank Kayoko Maekawa and Junko Yamagishi for their help.
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This study was supported by Grants-in-Aid for Scientific Research (B) grant no. 19H03729.
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Conception of the work: SU, MM, YD, and HW. Data collection and analysis: SU, TM, YK, KY, KG, MH, MH, TM, and ES. Manuscript writing/editing: AK, KI, and HW. Preparation of figures: MY and SU. Critical revision of the manuscript: AM-O, AK, KI, and HW. Final approval: all authors.
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The present study was approved by the Institutional Ethics Committee of Osaka University Hospital (#13266–13, #8226–6) and performed in accordance with the Declaration of Helsinki. All samples were obtained with the patients’ informed consent.
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ICOS+ regulatory T cells in gastric and colorectal tumors were closely associated with H. pylori infection and the prognosis of these patients. Pre-operative H. pylori eradication has potential as a novel cancer immune therapy.
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Urakawa, S., Yamasaki, M., Makino, T. et al. The impact of ICOS+ regulatory T cells and Helicobacter pylori infection on the prognosis of patients with gastric and colorectal cancer: potential prognostic benefit of pre-operative eradication therapy. Cancer Immunol Immunother 70, 443–452 (2021). https://doi.org/10.1007/s00262-020-02696-4
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DOI: https://doi.org/10.1007/s00262-020-02696-4