The seed genes in modules with the most connectivities referred to hub genes and TCGA KIRC data was used to perform validation using GEPIA database [24]. The RNA-sequencing (RNA-seq) data for hub genes were downloaded from the The Cancer Genome Atlas (TCGA, https://tcga-data.nci.nih.gov/tcga/) database. The analysis for expression level of hub genes between normal esophageal samples (n = 182) and ESCC samples (n = 286) was based on GTEx data in GEPIA from TCGA. Oncomine database was used to further analyse the expression level of hub genes with clinical traits [25, 26]. Logrank value p < 0.05 was considered to be statistically significant.
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