ArticleAnnals of translational medicine2020
Association between IDO activity and prognosis in patients with non-small cell lung cancer after radiotherapy.
Article in Annals of translational medicine, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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Who cites it
8 citing papers in PubMed, 13 citations in OpenAlex.
- The Tryptophan Paradox: From Microbiome-Mediated Homeostasis to Tumor-Driven Immune Escape.International journal of molecular sciences · 2026Review
- Depression and Anxiety After Radiation-Induced Brain Injury: A Review of Current Research Progress.Current oncology (Toronto, Ont.) · 2025Review
- Tryptophan metabolism at the crossroads of the neuro-immuno-microbial axis: implications for precision medicine in chronic diseases.Frontiers in cellular and infection microbiology · 2025Review
- Tobacco carcinogen induces tryptophan metabolism and immune suppression via induction of indoleamine 2,3-dioxygenase 1.Signal transduction and targeted therapy · 2022Article
- Epstein-Barr Virus Infection in Lung Cancer: Insights and Perspectives.Pathogens (Basel, Switzerland) · 2022Review
- Dynamic change of IDO1 activity predicts survival in patients with unresectable stage III NSCLC and chemoradiotherapy.Frontiers in immunology · 2022Article
- Indoleamine 2,3-Dioxygenase Immune Status as a Potential Biomarker of Radioiodine Efficacy for Advanced Distant Metastatic Differentiated Thyroid Cancer.Frontiers in oncology · 2022Article
- Functional Diversities of Regulatory T Cells in the Context of Cancer Immunotherapy.Frontiers in immunology · 2022Review
Corrections and comments
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Authors and funding
7 authors at 4 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundIndoleamine 2,3-dioxygenase (IDO), a limiting enzyme in the IDO/kynurenine (Kyn) pathway, converts tryptophan (Trp) into Kyn, and plays a significant role in immune suppression and tumor immune evasion. This study aimed to investigate the association between IDO activity and clinical outcomes in non-small cell lung cancer (NSCLC) patients who underwent radiotherapy (RT).
methodsSerum Kyn and Trp levels were measured in 104 NSCLC patients by high-performance liquid chromatography at baseline, and the following RT. The correlation between IDO activity, as computed by Kyn: Trp ratios and survival was estimated using Kaplan-Meier curves. Cox proportional hazard models are used in the univariate and multivariate analyses.
resultsBoth the Kyn levels and Kyn:Trp ratios were reduced after RT at a biologically equivalent dose (BED) of <70 Gy, while these increased at a BED of ≥70 Gy. Post/pre-Kyn levels were positively correlated with an objective response. Patients with a higher Kyn:Trp ratio pre-RT had the worse median progression-free survival (mPFS, 13.5
conclusionsIt was proved that RT could alter IDO-mediated immune activity and establish strong correlations between IDO activity and survival outcomes in NSCLC patients treated with RT. These present findings suggest that the profiling of IDO activity might allow for the prompt adjustment of RT doses and better predict patient response to RT.
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