cancer esophagealadenocarcinoma esophageal cancermalignant esophageal tumormetastatic esophageal cancerrecurrent esophageal cancerinoperable esophageal canceresophageal cancer hereditaryterminal esophageal cancerbenign esophageal tumoresophageal cancer curablestage 4 esophageal cancer symptomsmost common type of esophageal cancer