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Expression of indoleamine 2,3-dioxygenase (IDO) pathway genes in various cancer types. Expression of (A) IDO-1, (B) IDO-2, and (C) TDO-2 in various cancer types. Cancer type acronyms are standard the Cancer Genome Atlas (TCGA) abbreviations (https://gdc.cancer.gov/resources-tcga-users/tcga-code-tables/tcga-study-abbreviations). ESAD, esophageal adenocarcinoma; ESSC, esophageal squamous cell carcinoma.
