The patient, a 59-year-old man, received a pioneering cell transplant in 2021 and has been medication-free since 2022.

The experimental treatment involved creating an artificial version of cells found in the pancreas that produce insulin and keep blood sugar levels in check.

The man had suffered from type 2 diabetes for 25 years and had lost almost all function of these cells, known as islets.

He was deemed high risk of deadly complications, requiring multiple insulin injections every day to prevent him from going into a diabetic coma.