Comprehensive Perioperative Program Based on Prehabilitation, Nutritional Intervention and Psychological Support for Patients With Locally Advanced Operable Oesophagogastric Cancer

A single measurement before the start of preoperative treatment (baseline), after completion of chemotherapy 4-2 weeks before surgery, and 6 months after surgery.

Exercise training is prescribed in accordance with the guidelines for prescribing physical activity (the FITT methodology published by the ACSM in 2018) for a period of 2 months. Training is set at 60% of the baseline maximum inspiratory pressure (MIP) and is increased by 5% if the participant reports a rate of perceived exertion (RPE) \< 7 (RPE scale 1-10). Exercises is conducted under supervision using telemedicine technologies. Weekly online check-ins via video call using the MOU MEDDI platform (first 4 weeks), then once every 14 days. Alternatively, weekly training sessions at the gym for the first 4 weeks (3 times a week at home, walking for at least 30 minutes per training session), followed by independent training at home. The intensity of aerobic training is prescribed based on a target heart rate of 60-80% of the heart rate reserve. An important part of the evaluation is also the patient's adherence to the exercise intervention and their level of physical activity.

1. Preoperative evaluation in the Anesthesiology and Resuscitation Department (ARD)/Intensive Care Unit (ICU) and preoperative intensive care, assessment of the patient's condition, development of an anesthetic plan, and consultation with the patient and their family members. 2. Application of ERAS principles in the immediate preoperative period. 3. Application of ERAS principles intraoperatively. 4. Application of ERAS principles for the postoperative period. 5. Implementation of early detection of complications and their immediate resolution.

1. Assessment of nutrition using the SGA (Seven-Point Subjective Global Assessment) 2. Assessment of nutritional status (nutritional requirements) using laboratory values, anthropometry, and bioimpedance 3. Assessment of weight loss or gain using selected parameters 4. Assessment of intake of regular food, oral dietary supplements, dietary modifications, and artificial nutrition

Psychological intervention is provided to each patient at the following time points: 1) upon enrollment in the study, 2) before surgery, 3) 30 days after surgery, and 4) 6 months after surgery.

It is assessed using standardized questionnaires.

Monitoring of cellular and humoral immunity/endocrine function will be performed by flow cytometry using two peripheral blood samples (1 tube containing 2.7 mL of EDTA-anticoagulated blood and 1 tube containing 5 mL of anticoagulant-free blood for serum separation) at 4 time points: 1) upon study enrollment, 2) before surgery, 3) 30 days after surgery, and 4) 6 months after surgery. Multicolor (6 to 8 colors) protocols for the proposed immune profile have already been established.