Adjuvant Treatment for Incomplete Resection Thymoma or Thymic Carcinoma

This study is looking at what additional treatments (radiation, chemotherapy, or both) work best after surgery for thymoma or thymic carcinoma (cancers of the thymus gland, a small organ in the chest) when the surgeon was not able to remove the entire tumor. **You may be eligible if...** - You have been diagnosed with thymoma or thymic carcinoma - Your surgery did not completely remove the tumor (called an incomplete resection) - You are in good enough health to receive additional treatment - You have not yet started radiation or chemotherapy after surgery **You may NOT be eligible if...** - Your surgeon was able to remove all visible cancer - You have already received post-surgery radiation or chemotherapy - You have serious medical conditions that would make additional treatment unsafe - You have a different type of chest tumor Talk to your doctor to see if this trial is right for you.