A Study of Minimally Invasive Proximal Gastrectomy Versus Minimally Invasive Total Gastrectomy for Gastric and Gastroesophageal Junction Cancers

Inclusion Criteria: * Able to speak and read English, Spanish, Japanese or Korean * Patients with a biopsy-confirmed diagnosis of non-metastatic gastric or GEJ adenocarcinoma, who are scheduled to undergo MIPG or MITG for curative-intention * Age ≥ 18 Exclusion Criteria: * Patients with known malabsorption syndromes or a lack of physical integrity of the upper gastrointestinal tract * Patients with known narcotic dependence, with average daily dose \> 5 mg oral morphine equivalent * Subjects deemed unable to comply with study and/or follow-up procedures, at investigators' discretion * Patients who are pregnant (since are excluded from receiving standard-of-care MIPG or MITG)