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| A Doctor holding syringe filled with drug. Courtesy of BBC |
About 19,000 people live with Type 1 of the condition in Wales and 90% have less than 5% of these cells left.
This means they have to inject insulin but it is hoped the new drug will mean patients may not have to in the future.
The trials are being conducted by researchers at Cardiff and Vale University Health Board and two people have already been given the drug.
Currently, it costs the Welsh Government about £500m a year treating people with diabetes.
Problems occur when blood glucose levels in the bodies of diabetics are too high because they are unable to make the hormone, insulin.
The new drug could mean they are no longer dependent on injecting it and this will potentially reduce many of the problems associated with the chronic disease.
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While the majority of diabetics (about 170,000) have Type 2, diabetes costs the NHS in Wales approximately £500m a year, 10% of its annual budget.
About 80% of this is spent on managing complications, most of which could be prevented.
The first two patients in the world have been dosed with the investigational drug, which helps re-grow insulin-making beta cells of the pancreas, lost in patients living with the disease.
DIABETES UK CYMRU
They were closely monitored over 72 hours and so far, neither has had any major side effects.
The research team is now looking to recruit eight people who have had diabetes for more than two years to take part in wider-ranging trials.
"Despite everything achieved in diabetes care, advances in prevention haven't really occurred," said Dr Mohammad Alhadj Ali, who is working on the trials.
"More insulin-producing beta cells are needed for those with this form of diabetes."
The Welsh Government's Health and Care Research Wales team helps collaborations and the organisation's Carys Thomas said the work could prove "ground-breaking".
She described creating new treatment options for diabetics as "a top priority", adding: "It is essential that the NHS works closely with the pharmaceutical industry on research like this to develop drugs that could make a big difference to people's lives."
SOURCE: BBC News
