CAR-T cell, cancer treatment, immunotherapy, gene encoding CAR. CAR-T cells (or CAR-T cells) constitute a new form of immunotherapy in full development. They allow T lymphocytes to recognize cancer cells and then destroy them. This illustration represents all the stages of this anti-cancer therapy. First, a nurse takes a blood sample. In the laboratory, the patient's T lymphocytes are isolated and activated from this sample. Lymphocytes are genetically modified. A coding gene is introduced into the T lymphocytes. These genes are represented in green on the surface of the lymphocytes.