Abstract:
:Indoleamine 2,3-dioxygenase (IDO) is an enzyme with an immunosuppressive effect whose function is diverted by tumor cells to counteract immune cell functions, inducing immune escape of tumor cells. The aim of this study was to investigate the clinical significance of IDO in nasopharyngeal carcinoma (NPC). Compared to controls, NPC patients' plasma IDO activity was significantly higher, especially among patients with metastatic cancer (p=0.005). The immunohistochemical analysis revealed that high IDO expression was observed in 74% of NPC tissues and the epithelial IDO expression was inversely correlated to T-cell infiltration. Kaplan-Meier survival analysis showed that whatever the localization, intratumoral or stromal, patients with a high IDO expression and low T-cell infiltration have significantly lower survival rates. Moreover, in multivariate analysis, intratumoral and stromal IDO expression were found to be independent prognostic factors for disease-free survival (p=0.016; HR: 3.52) and overall survival (p=0.015; HR: 4.76) respectively. Our findings provide evidence that IDO is involved in tumor immune evasion of NPC, suggesting that it could be a relevant therapeutic target for NPC.
journal_name
Immunol Lettjournal_title
Immunology lettersauthors
Ben-Haj-Ayed A,Moussa A,Ghedira R,Gabbouj S,Miled S,Bouzid N,Tebra-Mrad S,Bouaouina N,Chouchane L,Zakhama A,Hassen Edoi
10.1016/j.imlet.2015.11.012subject
Has Abstractpub_date
2016-01-01 00:00:00pages
23-32eissn
0165-2478issn
1879-0542pii
S0165-2478(15)30070-5journal_volume
169pub_type
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journal_title:Immunology letters
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journal_title:Immunology letters
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