title: How can we diagnose the early stage of esophageal cancer? Endoscopic diagnosis.
mesh_terms: D001706:Biopsy; D003581:Cytodiagnosis; D004938:Esophageal Neoplasms / Q000145:classification / Q000175:diagnosis* / Q000473:pathology; D004945:Esophagoscopy; D004947:Esophagus / Q000473:pathology; D006801:Humans; D008207:Lymphatic Metastasis; D013194:Staining and Labeling / Q000379:methods; D013997:Time Factors