Fig. 6From: Identification of four genes and biological characteristics of esophageal squamous cell carcinoma by integrated bioinformatics analysis Validation of the expression levels of the four hub genes between normal esophageal samples and ESCC samples based on TCGA and GTEx data in GEPIA. a–d, Expression levels of SPP1, MMP12, COL10A1 and COL5A2 in normal esophageal samples and ESCC samples. All of the data are presented as means ± SD. Significant differences were defined by a p-value < 0.05Back to article page