The Effect of exeRcise And Diet on Quality of Life in Patients With Incurable Cancer of Esophagus and Stomach (RADICES)

Inclusion Criteria: * Incurable adenocarcinoma of the esophagus or stomach * Recurrence after treatment with curative intent or irresectable/metastatic disease at primary diagnosis. Inclusion can take place regardless of the plan or the actual initiation of multi-line systemic treatment. (i.e. patients that have already started with anticancer therapy are eligible for inclusion too)\* * Able and willing to perform the exercise and nutritional program and wear the activity tracker. * Able and willing to fill out the POCOP/RADICES questionnaires. * Life expectancy \> 12 weeks. * Age ≥ 18 years. Exclusion Criteria: * Unstable bone metastases inducing skeletal fragility as determined by the treating clinician. * Untreated symptomatic known brain metastasis. * Serious active infection. * Too physically active (i.e. \>210 minutes/week of moderate-to-vigorous intentional exercise) or engaging in intense exercise training comparable to the RADICES exercise program. * Severe neurologic or cardiac impairment according to the American College of Sports Medicine criteria. * Uncontrolled severe respiratory insufficiency as determined by the treating clinician or if the patient is dependent on oxygen suppletion in rest or during exercise. * Uncontrolled severe pain. * Any other contraindications for exercise as determined by the treating physician. * Any circumstances that would impede adherence to study requirements or ability to give informed consent, as determined by the treating cli…