SOCS2 and esophageal squamous cell carcinoma: WDFY3‐AS2 suppressed ESCC proliferation and invasion by sponging miR‐2355‐5p to up‐regulate SOCS2 expression, further resulting in inactivation of JAK2/Stat5 signalling pathway, which will trigger the suppression of cell proliferation and invasion in ESCC cells.