Two mRNA (TBC1D2 and ATP6V0E1) in green module and six mRNAs (SPI1, RNASE6, C1QB, C1QC, CSF1R, and C1QA) in cyan module were considered as real hub mRNAs, and they were closely related to the overall survival in ESCC (Figure 4). The gene discussed is C1QC; the disease is esophageal squamous cell carcinoma.