CD8+ T Cell Therapy and Pembrolizumab in Treating Patients With Metastatic Gastrointestinal Tumors

This phase I pilot trial studies the side effects of cluster of differentiation 8 (CD8)+ T cells in treating patients with gastrointestinal tumors that have spread to other places in the body. Tumor cells and blood are used to help create an adoptive T cell therapy, such as CD8+ T cell therapy, that is individually designed for a patient and may help doctors learn more about genetic changes in the tumor. Immunotherapy with monoclonal antibodies, such as pembrolizumab, may help the body’s immune system attack the cancer, and may interfere with the ability of tumor cells to grow and spread. Giving CD8+ T cell therapy and pembrolizumab may work better in treating patients with gastrointestinal tumors.