Personalized DC Vaccine for Postoperative Cancer

This study is testing a personalized cancer vaccine made from a patient's own immune cells (called dendritic cells) after surgery. The idea is to "train" the immune system to recognize and attack any remaining cancer cells after a tumor is removed. It's being tested in patients with gastric (stomach), liver, lung, or colorectal cancer who have already had surgery. **You may be eligible if...** - You have been newly diagnosed with stomach cancer, liver cancer, non-small cell lung cancer, or colorectal cancer - You have had surgery or ablation to remove the tumor (with the goal of a cure) - You are in good general health (ECOG 0 or 1) - Your organs (kidneys, liver, blood) are functioning adequately **You may NOT be eligible if...** - There is any evidence your cancer has spread - You have an active infection such as hepatitis B, hepatitis C, HIV, or tuberculosis - You have a blood clotting disorder or immune system condition Talk to your doctor to see if this trial is right for you.