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Published in: Cancer Immunology, Immunotherapy 10/2020

Open Access 01-10-2020 | Colorectal Cancer | Original Article

Expression of immune checkpoints and T cell exhaustion markers in early and advanced stages of colorectal cancer

Authors: Reem Saleh, Rowaida Z. Taha, Salman M. Toor, Varun Sasidharan Nair, Khaled Murshed, Mahwish Khawar, Mahmood Al-Dhaheri, Mahir Abdulla Petkar, Mohamed Abu Nada, Eyad Elkord

Published in: Cancer Immunology, Immunotherapy | Issue 10/2020

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Abstract

Despite recent advances in colorectal cancer (CRC) treatment, a large proportion of patients show limited responses to therapies, especially in advanced stages. There is an urgent need to identify prognostic biomarkers and/or therapeutic targets in advanced stages, aiming to improve the efficacy of current treatments. We aimed to determine prognostic biomarkers in tumor tissue and circulation of CRC patients, with a special focus on T cell exhaustion markers. We found that mRNA levels of PD-1, TIM-3, CTLA-4, TIGIT, CD160, CD244, KLRG1, TOX2, TOX3, Ki-67, and PRDM1 were elevated in CRC tumor tissues. We also investigated differences in gene expression between early and advanced disease stages. We found that TOX and potentially TIM-3, CTLA-4, VISTA, TIGIT, KLRG1, TOX2, SIRT1, Ki-67, and Helios mRNA levels in tumor tissue were elevated in advanced disease stages, suggesting their potential roles in CRC progression. In contrast, PD-1 and CD160 levels in tumor tissue were downregulated in advanced stages. In the circulation of CRC patients, mRNA levels of PD-1, VISTA and LAG-3 were higher than those of healthy individuals. Moreover, in circulation, PD-1, CTLA-4 and TIGIT mRNA levels were reduced in advanced stages. Interestingly, levels of PD-1 in both tumor tissue and circulation were reduced in advanced stages, suggesting that targeting PD-1 in patients with advanced stages could be less effective. Altogether, these findings suggest some potential T cell exhaustion markers that could be utilized as prognostic biomarkers and/or therapeutic targets for CRC. However, further investigations and validations in larger cohorts are required to confirm these findings.
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Metadata
Title
Expression of immune checkpoints and T cell exhaustion markers in early and advanced stages of colorectal cancer
Authors
Reem Saleh
Rowaida Z. Taha
Salman M. Toor
Varun Sasidharan Nair
Khaled Murshed
Mahwish Khawar
Mahmood Al-Dhaheri
Mahir Abdulla Petkar
Mohamed Abu Nada
Eyad Elkord
Publication date
01-10-2020
Publisher
Springer Berlin Heidelberg
Published in
Cancer Immunology, Immunotherapy / Issue 10/2020
Print ISSN: 0340-7004
Electronic ISSN: 1432-0851
DOI
https://doi.org/10.1007/s00262-020-02593-w

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