METTL14 and esophageal squamous cell carcinoma: Intriguingly, although METTL14 did not influence the promoter activity of primary mir‐99a (Figure S3L), pri‐mir‐99a expression and the ratio of pri‐mir‐99a/mature miR‐99a‐5p were increased in the METTL14‐silenced ESCC cells but reduced in the METTL14‐overexpressing ESCC cells (Figure 3F,G).