MDM2 and esophageal squamous cell carcinoma: The panel consisting of three TAAbs (HCCR, C‐myc, and MDM2) and three miRNAs (miR‐21, miR‐223, and miR‐375) attained great diagnostic value for ESCC, with an area under the receiver operating characteristic curve (AUC) of 0.89 (95% CI: 0.85‐0.93) with the sensitivity of 69%, specificity of 90%, and the coincidence rate of 81%.