Immunonutrition Reduces Acute Esophagitis After Thoracic Radiotherapy in Lung Cancer

This study is testing whether a special nutrition formula (immunonutrition) taken before and during radiation therapy can reduce esophagitis — painful inflammation of the esophagus (food pipe) — which is a common and uncomfortable side effect of chest radiation for lung cancer. **You may be eligible if...** - You are 18 years old or older - You have been diagnosed with lung cancer (non-small cell or small cell) confirmed by a lab test - You are scheduled to receive radiation therapy to your chest, with the esophagus within the radiation zone - You can eat and drink normally by mouth - Your general health score (ECOG) is 0 or 1 **You may NOT be eligible if...** - You have certain serious organ problems - You cannot eat by mouth - You are pregnant or breastfeeding - You are receiving certain other treatments that would conflict with the study Talk to your doctor to see if this trial is right for you.