Abstract
Background
Although regulatory T cells (Tregs) are thought to play an important role in immune suppression, their clinical significance in head and neck squamous cell carcinoma (HNSCC) is unclear. A recent study reported Tregs could be divided into functional subsets based on the expression of CD45RA and Foxp3.
Method
The frequency of circulating Treg subsets was analyzed in patients with HNSCC and compared with the frequency in patients with benign tumors. The association of Treg subsets with the frequency of lymphocyte subsets, status of progression, clinical course, and prognosis were also examined.
Results
The frequency of CD4+Foxp3+ Tregs was comparable between HNSCC patients and age-matched benign tumor patients; however, CD45RA−Foxp3high Tregs were significantly increased in HNSCC patients, in particular those with advanced stage tumors. The high frequency of CD45RA−Foxp3high Tregs correlated with a poor prognosis and the low frequency of CD45RA−Foxp3high Tregs before treatment showed a better clinical outcome, even in patients with advanced stage tumors. CD45RA−Foxp3high Treg numbers were decreased after intensive treatments; however, Treg numbers recovered in the early stages of recurrent cases, even before the clinical manifestation.
Conclusion
CD45RA−Foxp3high Tregs are associated with the clinical course of HNSCC and might be a new target for treatment and an early marker of tumor recurrence in HNSCC patients.
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Abbreviations
- CDDP:
-
Cisplatin
- CCRT:
-
Combined chemotherapy and radiotherapy
- CFSE:
-
Carboxyfluorescein diacetate succinimidyl ester
- CR:
-
Complete remission
- CTLA-4:
-
Cytotoxic T-lymphocyte-associated protein 4
- HNSCC:
-
Head and neck squamous cell carcinoma
- MDSCs:
-
Myeloid derived suppressor cells
- PBMCs:
-
Peripheral blood mononuclear cells
- RT:
-
Radiation therapy
- Tregs:
-
Regulatory T cells
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Acknowledgements
This study was funded by a Grants-in-Aid for Scientific Research from MEXT KAKENHI (Ministry of Education, Culture, Sports, Science and Technology) Grant number 15K10799.
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Ihara, F., Sakurai, D., Horinaka, A. et al. CD45RA−Foxp3high regulatory T cells have a negative impact on the clinical outcome of head and neck squamous cell carcinoma. Cancer Immunol Immunother 66, 1275–1285 (2017). https://doi.org/10.1007/s00262-017-2021-z
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DOI: https://doi.org/10.1007/s00262-017-2021-z