The Study of High-protein Nutritional Support Impact on Postoperative Outcomes in Patients With Primary Lung Cancer

Inclusion Criteria: * Presence of morphological verification of non-small cell lung cancer (NSCLC) without distant metastases; * Appointment of surgical treatment for primary lung cancer with anatomical resection of the lung (lobectomy, bilobectomy or pneumonectomy); * Nutritional deficiency or risk of its development (≥3 points on the Nutrition Risk Screening 2002 (NRS-2002) scale); * No history of nutritional support; * ECOG (Eastern Cooperative Oncology Group Performance Status Scale) score 0 - 2; * Life expectancy over 3 months; * Absence of serious diseases of the gastrointestinal tract, disorders of the liver, kidneys, systemic blood diseases and metabolic disorders at the time of inclusion in the study; * Absence of severe uncontrolled concomitant chronic diseases and acute diseases (including infectious ones); * Availability of signed informed consent for inclusion in the study and processing of personal data Exclusion Criteria: * Terminal state of the patient, ECOG (Eastern Cooperative Oncology Group Performance Status Scale) 3-4; * State of refractory cachexia; * Bleeding, serious injury or blood transfusions in the previous 6 months; * Decay / abscess in the area of the tumor lesion; * Presence at the same time of a tumor process of another localization, metastatic lesion of the lungs; * The presence of concomitant diseases in the stage of decompensation; * Pregnancy or lactation; * Allergy to or intolerance to any of the components of Nutridrink Compact Protein, galactosemia, allergy to cow's milk proteins; * The presence of contraindications to the use of enteral nutrition * Participation in another study currently or in the past 30 days; * Any other medical or non-medical reason that, in the physician's opinion, may prevent the patient from participating in the study