Malnutrition is a frequent symptom of various malignant diseases and is frequently observed in patients with gastrointestinal tumors. Eicosapentanoic acid (EPA) has been introduced as specific and anticatabolic acting substrate in cancer patients. Only few randomized trials are available which investigated the effect of EPA in form of an EPA-enriched, protein- and energy-dense oral nutritional supplement mostly in patients with pancreatic carcinoma.