Evaluate the clinical safety and feasibility of NKG2D CAR-T administrated by hepatic artery transfusion for patients with previously treated liver metastatic colorectal cancer. Evaluate the maximum tolerated dose (MTD), dose limiting toxicities (DLT), and toxicity spectrum of NKG2D CAR-T treatment administrated by hepatic artery transfusion. Secondary Objectives: Evaluate the efficacy of NKG2D CAR-T administrated by hepatic artery transfusion for patients with previously treated liver metastatic colorectal cancer, including PSF, DCR, SD >= 8 weeks, ORR, OS, and DOR.
Evaluate the clinical safety and feasibility of NKG2D CAR-T administrated by hepatic artery transfusion for patients with previously treated liver metastatic colorectal cancer.