Intralesional steroid injection after endoscopic ballon dilation for stricture after endoscopic therapy (EMR, ESD, PDT) for esophageal cancer: a randomized controlled study

INTERVENTION: Steroid injection for endoscopic ballon dilation's lacerations after endoscopic therapy's stricture No injection CONDITION: Esophageal cancer PRIMARY OUTCOME: Period between endoscopic ballon dilation and restructure symptom SECONDARY OUTCOME: Improvement rate of dysphagia score,; Safety of steroid injection to lacerations after endoscopic ballon dilation for esophageal endoscopic therapys scars,; Adverse events. INCLUSION CRITERIA: Esophageal stricture after esophageal EMR, ESD, PDT. Patients have stricture symptom (Dysphagia score, more than 2) Histologies are esophageal cancers. Strictures are located in thoracic and abdominal esophagus. No organ failure More than 20 years old and less than 85 years old. Written informed consent had been obtained