Immunonutrition for Improving the Efficacy of Immunotherapy in Patients With Metastatic Non-small Cell Lung Cancer

In addition to nutritional counseling, patients will receive two servings of an oral high-calorie-high-protein nutritional liquid supplement enriched in immunonutrients (Oral Impact®). The intervention will start approximately two weeks before anticancer treatment initiation and will continue up to first disease re-assessment (12-14 weeks) and prolonged according to patient's needs

Patients will receive nutritional counseling as standard of care. Nutritional counseling may comprise the use of oral nutritional supplements (ONS), which are usually prescribed when patients are unable to maintain satisfactory spontaneous food intake (less than 50% of the requirement for more than one week or only 50-75% of the requirement for more than two weeks). Therefore, in this arm the use of isonitrogenous standard blend ONS will be considered according to the regular assessment of food intake.