1. Having a pathological diagnosis of non small cell lung cancer

2. Having a stage-IV disease

3. To have received at least one course of treatment

4. Presence of positron emission tomography /computed tomography (PET/CT) examination before treatment and having it taken in our hospital

5. The data about the study can be accessed in our center.

6. To be over 18 years old

Prognostic Value of Body Composition in Lung Cancer