ALKBH5 and esophageal squamous cell carcinoma: The eraser ALKBH5 is downregulated and acts as a tumor suppressor in esophageal squamous cell carcinoma by inhibiting m6A/DGCR8-dependent miR-194-2 biogenesis and releasing RAI1 expression, as well as through positive feedback between miR-193a-3p and ALKBH5.