Diabetics using stem-cell therapy have been able to stop taking insulin injections for the first time, after their bodies started to produce the hormone naturally again.

In a breakthrough trial, 15 young patients with newly diagnosed type 1 diabetes were given drugs to suppress their immune systems followed by transfusions of stem cells drawn from their own blood.

The results show that insulin-de-pendent diabetics can be freed from reliance on needles by an injection of their own stem cells. The therapy could signal a revolution in the treatment of the condition, which affects more than 300,000 Britons.

People with type 1 diabetes have to give themselves regular injections to control blood-sugar levels, as their ability to create the hormone naturally is destroyed by an immune disorder.

All but two of the volunteers in the trial, details of which are published today in the Journal of the American Medical Association (JAMA), do not need daily insulin injections up to three years after stopping their treatment regimes.

The findings were released to reporters yesterday as the future of US stem-cell research was being debated in Washington.

Stem cells are immature, unpro-grammed cells that have the ability to grow into different kinds of tissue and can be sourced from people of all ages.

Previous studies have suggested that stem-cell therapies offer huge potential to treat a variety of diseases such as Alzheimer’s, Parkin-son’s and motor neuron disease. A study by British scientists in November also reported that stem-cell injections could repair organ damage in heart attack victims.

But research using the most versatile kind of stem cells – those acquired from human embryos – is currently opposed by powerful critics, including President Bush.

The JAMA study provides the first clinical evidence for the efficacy of stem cells in type 1 diabetes. Sufferers of the chronic condition, which normally emerges in childhood or early adulthood, have to inject themselves at least four times a day.

Type 2 diabetes, which tends to affect people later in life, is linked to lifestyle factors such as obesity. There are almost two million type 2 diabetics in Briton, most of whom control their blood-sugar levels with pills or through diet.

The new study, by a joint team of Brazilian and American scientists, found that one of the first patients to undergo the procedure has not used any supplemental synthetic