1. Collection: T cells are harvested from the patient's blood. 2. Genetic Modification: The T cells are genetically engineered to express the CAR using viral vectors. 3. Expansion: The modified T cells are expanded in the lab to achieve sufficient quantities. 4. Infusion: The CAR-T cells are infused back into the patient. 5. Monitoring: The patient is closely monitored for efficacy and potential side effects.