CAR-T cell therapy, a groundbreaking immunotherapy, modifies patient T-cells to target and destroy cancer cells, acting as 'living drugs.' With 11 products commercialized, including 7 FDA-approved, the therapy shows promise in treating blood cancers. Challenges include expanding to solid tumors, reducing 'vein-to-vein' time, and improving reimbursement. The industry is advancing through gene-transfer techniques, partnerships, and 'on-off' switches in CAR-T cells to enhance efficacy and safety.