The analysis of RNA-seq expression data gathered by The Cancer Genome Atlas (TCGA) Research Network and the Genotype-Tissue Expression (GTEx) project indicated DDAH1 upregulation in ESCC [25], although confirming individual studies, analyzing DDAH1 association with reference to ESCC pathology, seem to be missing. Here, DDAH1 is linked to esophageal squamous cell carcinoma.