Scientists yesterday unveiled a revised classification for diabetes, one they said could lead to better treatments and help doctors more accurately predict life-threatening complications from the disease.
There are five distinct types of diabetes that can occur in adulthood, rather than the two previously recognized, they reported in The Lancet Diabetes & Endocrinology, a leading medical journal.
The findings are consistent with the growing trend toward “precision medicine,” which takes into account differences between individuals in managing disease.
In the same way that a patient requiring a transfusion must receive the right blood type, diabetes sub-types need different treatments, the study suggested.
Similarly, scientists have also identified distinct kinds of microbiome — the bacterial ecosystem in our digestive tract — that can react differently to the same medication, rendering it more or less effective.
“This is the first step towards personalized treatment of diabetes,” said senior author Leif Groop, an endocrinologist at Lund University in Sweden, adding that the new classification is a “paradigm shift” in how the disease is viewed.
People with diabetes have excessively high blood glucose, or blood sugar, which comes from food.
About 420 million people around the world suffer from diabetes, with the number expected to rise to 629 million by 2045, according to the International Diabetes Federation.
Previously, the disease was divided into two sub-types.
With type-1 — generally diagnosed in childhood and accounting for about 10 percent of cases — the body simply does not make insulin, a hormone that helps regulate blood sugar levels.
For type-2, the body makes some insulin, but not enough, which means glucose stays in the blood.
This form of the disease correlates highly with obesity and can, over time, lead to blindness, kidney damage and heart disease or stroke.
Acute cases might also require limbs to be amputated.
It has long been known that type-2 diabetes is highly variable, but classification has remained unchanged for decades.
For the study, the researchers monitored 13,270 newly diagnosed diabetes patients ranging in age from 18 to 97.
By isolating measurements of insulin resistance, insulin secretion, blood sugar levels, age and the onset of illness, they distinguished five distinct clusters of the disease — three serious and two milder forms.
Among the severe types, a group of patients with insulin resistance — in which cells are unable to use insulin effectively — was at far higher risk of kidney disease.
“This group has the most to gain from the new diagnostics as they are the ones who are currently most incorrectly treated,” Groop said.
Another group facing serious complications was composed of relatively young, insulin-deficient patients, Groop said.
The third “severe” group were people with autoimmune diabetes corresponding to the original type-1 diagnosis.
The two other groups have milder types of the disease, including one, which includes about 40 percent of patients, beset with a form of diabetes related to advanced age.
“This will enable earlier treatment to prevent complications in patients who are most at risk of being affected,” said lead author Emma Ahlqvist, an associate professor at Lund University.
The results were checked against three other studies done in Sweden and Finland.
“The outcome exceeded our expectations,” Groop said.
The researchers plan to launch similar studies in China and India.
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