A woman treated with a pioneering type of immunotherapy for a solid tumour has been in remission for more than 18 years with no further treatments, experts have revealed.The therapy involves taking T-cells, a type of white blood cell, from a patient and genetically engineering them to target and kill cancer cells. These modified T-cells are grown in a laboratory and then infused back into the patient.Known as CAR (chimeric antigen receptor) T-cell therapy, the approach has proved particularly su...