PPARG and esophageal squamous cell carcinoma: PPARG was significantly down‐regulated in ESCC tissues compared to matched mucosa tissues, for which the results were not compatible with our bioinformatics analyses showing that PPARG was significantly up‐regulated in ESCC with G3 (poorly‐differentiated) compared to those with G1 (well‐differentiated) and G2 (moderately‐differentiated).