Abstract
The prognostic value of the local immune phenotype in patients with colorectal cancer has been extensively studied. Neoadjuvant radiotherapy and/or chemotherapy may potentially influence these immune responses. In this study, we examined the prognostic role of indoleamine-2,3-Dioxygenase (IDO1) and infiltrating cytotoxic T lymphocytes (CD8+) in locally advanced rectal carcinomas after neoadjuvant treatment. Expression of IDO1 and CD8 was evaluated by immunohistochemistry in 106 archival tumour tissue samples from patients following neoadjuvant chemoradiation and radical resection. The average infiltration of IDO1+ and CD8+ cells was calculated along the tumour invasive front, in the tumour centre and within the neoplastic cells and expressed as total scores. Of the tumour specimens evaluable for immunohistochemistry, 100% showed CD8+ lymphocyte infiltration and 93.4% stained positive for IDO1. Total IDO1 score positively correlated with total CD8 score for all three subsites (p = 0.002, Kendall-tau-b 0.357). A high total CD8 score was positively correlated with lower ypUICC-stages (p = 0.047) and lower ypT-categories (p = 0.032). Total IDO1 expression showed a clear trend towards a lower risk of recurrence (p = 0.078). A high total IDO1 score was an independent prognostic marker for prolonged disease-free survival (HR 0.38, p = 0.046) and a high total CD8 score for favourable overall survival (HR 0.16, p = 0.029). Analysis of the local CD8 and IDO1 expression profile may be a helpful tool in predicting prognosis for patients with locally advanced rectal cancer following neoadjuvant chemoradiation.
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Abbreviations
- AJCC/UICC:
-
American Joint Committee on Cancer/Union Internationale Contre le Cancer
- CD8:
-
Cytotoxic T lymphocyte
- DFS:
-
Disease-free survival
- HR:
-
Hazard ratio
- IDO1:
-
Indoleamine-2,3-Dioxygenase 1
- IE:
-
Intraepithelial
- LARC:
-
Locally advanced rectal cancer
- OS:
-
Overall survival
- ST:
-
Stromal
- TDO:
-
Tryptophan-2,3-dioxygenase
- TME:
-
Total mesorectal excision
- TNM:
-
Tumour-node-metastasis
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Acknowledgements
The authors would like to thank Sabine Roth for her tireless efforts and qualified support in the set-up of IDO1 immunohistochemistry. We thank Mohammed Hankir for proofreading the manuscript.
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Julia Schollbach: performed immunohistochemistry, manuscript writing. Stefan Kircher: performed immunohistochemistry. Armin Wiegering: study design, manuscript writing. Florian Seyfried: study design, manuscript writing. Ingo Klein: study design. Andreas Rosenwald: study design. Christoph-Thomas Germer: manuscript writing. Stefan Löb: study design, manuscript writing.
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Patient and treatment characteristics were retrospectively collected from patient records and the Würzburg comprehensive cancer registry. All procedures performed were in accordance with the standards of the institutional ethical committee and with the 1964 Helsinki declaration and its later amendments. Approval of the study was obtained from the Ethics Committee, Medical Faculty, University of Würzburg, Germany (reference number 34/16). All patients provided informed written consent to the use of their anonymized data in scientific studies.
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Schollbach, J., Kircher, S., Wiegering, A. et al. Prognostic value of tumour-infiltrating CD8+ lymphocytes in rectal cancer after neoadjuvant chemoradiation: is indoleamine-2,3-dioxygenase (IDO1) a friend or foe?. Cancer Immunol Immunother 68, 563–575 (2019). https://doi.org/10.1007/s00262-019-02306-y
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DOI: https://doi.org/10.1007/s00262-019-02306-y