Galenos 2 Immunonutrition in Head and Neck, Lung, and Rectal Cancer Patients

This prospective interventional study will enroll adult patients with head and neck squamous cell carcinoma, locally advanced rectal cancer, or lung cancer who are candidates for standard chemoradiotherapy, chemotherapy, radiotherapy, or immunotherapy according to clinical practice. All enrolled participants will receive a galenic immunonutrition formula twice daily starting on the first day of antineoplastic treatment and continuing for up to 45 days, in addition to standard nutritional counseling and routine oncologic care. The study will prospectively assess treatment-related toxicity, nutritional status, body composition, muscle function, cytokine profiles, quality of life, physical activity, treatment adherence/tolerance, and compliance with the galenic formula. Outcomes in GALENOS 2 will be compared with matched or pooled control patients from the GALENOS 1 observational study