An 11-year-old Indian-origin boy has become the first patient to receive a pioneering new cancer therapy (CAR-T) by the UK's state-funded National Health Service.
CAR-T is a personalized form of cancer treatment.
CAR-T involves removing immune cells and modifying them in a laboratory so they can recognize cancer cells.
Immunotherapy is a treatment that uses your body's own immune system to help fight cancer.
Blood taken from patient and the white blood cells are separated out in the first stage, the rest of the blood being returned to the patient.
Then harmless virus is used to insert genes into T-cells, a special type of immune cell.
These genes cause the T-cells to add a hook on to their surface, known as a chimeric antigen receptor (CAR).
These engineered CAR-T cells - programmed to recognize and destroy the patient's cancer cells - are multiplied in huge numbers and then infused back into the patient.