Preoperative Home-based Multimodal Prehabilitation Based on 5G + Artificial Intelligence Mobile Health

Inclusion Criteria: * Aged 18 years or older * Eastern Cooperative Oncology Group (ECOG) performance status score of 0 or 1 * Histologically confirmation of gastric or gastroesophageal junction (GEJ) adenocarcinoma. For GEJ carcinomas, eligibility is strictly confined to those presenting with Siewert type III tumors or Siewert type II tumors that do not mandate a concurrent thoracotomy * Surgery is planned after neoadjuvant therapy * Capacity to comprehend and voluntarily sign a written informed consent form * Ability to use digital technology (e.g., smart phones, wearable devices) independently or with the assistance of family members Exclusion Criteria: * Distant metastasis * Severe cardiac dysfunction (preoperative LVEF \< 30% or NYHA classification IV), severe liver dysfunction (Child-Pugh C grade), severe kidney dysfunction (preoperative CRRT was received), ASA grade IV or above; 6MWD ≤ 250 meters * Within 6 months before enrollment, the patient had experienced cerebral hemorrhage, cerebral infarction, TIA, or suffered from central nervous system diseases or mental disorders, and was unable to cooperate in completing neoadjuvant therapy and prehabilitation * Presence of severe systemic infections (e.g., multiple organ dysfunction syndrome \[MODS\]) or active infectious diseases (e.g., tuberculosis) * Emergency surgery is required due to complications of the tumor (e.g. bleeding, perforation, obstruction) * Simultaneous tumors or other diseases requiring simultaneous s…