Advanced Gastrointestinal Cancer

This clinical trial is designed to study an investigational cell therapy called cCTL-GL01 in patients with advanced gastrointestinal cancers (including cancers of the stomach, esophagus, colon, or rectum) that have not responded well to standard treatments. The main goals of this study are to find out: If cCTL-GL01 is safe and what side effects it might cause; How well cCTL-GL01 works to control or shrink tumors.