SLC25A21 and esophageal squamous cell carcinoma: Moreover, low SLC25A21‐AS1 expression in the ESCC tumour tissues was indicated by the data of the TCGA and GTEx datasets (Figure S6B); however, we did not detect significant differences between 179 paired tumours and adjacent normal tissues samples of the GSE53625 dataset or in 28 paired tissues samples of the cDNA microarray (Figure S6C,D).