Figure 1. Identification of CRGs and their association with the immune score and clustering of TCGA-ESCA. (A) Association between 27 CRGs and the ESTIMATE results. (B) Association between 7 CRGs and the ESTIMATE results. (C) Comparison of expression levels of the 7 CRGs in tumor and normal tissues. (D) TCGA-ESCA patients were classified into two clusters based on their expression levels of the 7 CRGs. (E) A PPI network of the differentially expressed genes associated with the 7 CRGs. (F) A PPI network of the differentially expressed genes associated with the 27 CRGs. *P < 0.05, **P < 0.01, ***P < 0.001.