Clinical Research Directory

Inclusion Criteria: * Patients with clinical stage 1-3 primary esophageal cancer at diagnosis who have planned or received treatment, including esophageal resection and reconstruction, with curative intent, and their families\*. * You are at least 18 years of age * Have a native-level understanding of Korean * Who consented to this study Exclusion Criteria: * Concurrent multiple cancers at the time of diagnosis or a history of diagnosed and treated other organ cancers within the past year at the time of diagnosis * Have had esophageal resection and reconstruction surgery for other reasons before being diagnosed with esophageal cancer * Persons with limited cognitive and communication abilities * The patient has had problems progressing to oral feeding after surgery, requiring a concurrent ileostomy, or the investigator determines that an interventional study is not appropriate. * Individuals with reduced renal function for whom protein intake is not recommended (estimated GFR \<60 mL/min/1.73 m2) * People who are unable to walk due to joint problems, paralysis, etc. * Those who do not use smartphones