Evaluation of Bile Acid Concentrations and Their Signaling as Markers of Testicular Tumorigenesis and Germ Cell Tumor Chemosensitivity

This study is investigating whether bile acids — natural chemicals in the digestive system — may play a role in testicular cancer development and how well the cancer responds to chemotherapy. Researchers will analyze blood samples from men with testicular cancer to measure bile acid levels. **You may be eligible if...** - You are an adult male - You have been clinically diagnosed with a germ cell tumor of the testis (a type of testicular cancer) - You are in the period before your testicle removal surgery - You are affiliated with a Social Security organization (in France) **You may NOT be eligible if...** - You are a minor (under 18) - You have already had your testicle removed - You do not have a germ cell tumor diagnosis Talk to your doctor to see if this trial is right for you.