Dubious benefits?
The advantages of screening for type 1 diabetes would not be limited to potential access to preventive therapies and a smooth transition to insulin therapy at the correct point in time, according to Dr. Ziegler. Participation in the FR1DA study dramatically reduced the risk of diabetic ketoacidosis (DKA). Between 2015 and 2023, the overall rate of ketoacidosis associated with the manifestation of clinical type 1 diabetes was 4.3%. In contrast, the general DKA rate in Germany has remained largely unchanged for the last 2 decades at between 20% and 25%.
In addition, the FR1DA children exhibited better beta cell function and better metabolic function at clinical diagnosis of type 1 diabetes. This finding was observed in a comparison with children with a spontaneous diabetes diagnosis from the DiMelli study. “It is important that there is a lot of data that shows how, in the long term, this is associated with a better morbidity and mortality,” said Dr. Ziegler.
Despite the impressive data from the FR1DA study, not all diabetes experts are convinced that a general screening for type 1 diabetes would be beneficial. Beate Karges, MD, PhD, of the Clinic for Pediatric and Adolescent Medicine of the Bethlehem Hospital Stolberg (Germany) and the endocrinology and diabetology department at the University Hospital Aachen (Germany), stressed, “Screening makes sense if the disease is curable in the preclinical phase or if there is a significantly better prognosis in the event of early diagnosis and treatment.”
Severe side effects
Even with an early-stage diagnosis, curing type 1 diabetes is impossible. The new anti-CD3 antibody teplizumab merely delays the manifestation of symptoms for 3 years. However, this delay has its price. The summary of product characteristics for teplizumab contains warnings of severe lymphopenia lasting many weeks, cytokine release syndrome, severe infections, and hypersensitivity reactions. Furthermore, vaccinations may not be administered during teplizumab treatment and therefore must be completed in advance.
“Preventing type 1 diabetes is still not possible, we can only delay it, and the long-term efficacy and safety of this immunotherapy are not clear,” said Dr. Karges. She added that a significant reduction in the DKA rate – as observed in the FR1DA study – may be possible even without screening. This possibility was demonstrated by a model project in Stuttgart, Germany, in which the DKA rate was significantly reduced through education alone.
Education reduces ketoacidosis
“The families were given information about the early signs of type 1 diabetes during the education investigation. Through this [education], a reduction in the ketoacidosis rate from 28% to 16% was achieved,” said Dr. Karges. It is also known from studies of familial type 1 diabetes that secondary sufferers in the family only exhibit a DKA rate of 7%. “Through education within the family and awareness campaigns, the DKA rate can be reduced by 40%-65%,” said Dr. Karges.
Dr. Karges also doubts whether starting insulin therapy earlier “at the correct point in time” elicits long-term advantages. Secondary sufferers with familial type 1 diabetes have better HbA1c values in the first few years after diagnosis. “But as they progress beyond 2, towards 10 years, the difference in HbA1c values diminishes,” said Dr. Karges.
Whether the patient has DKA at type 1 diabetes diagnosis also seems to make little difference in the long term. “There is also no difference in the HbA1c value in the 2-10 years after diagnosis,” said Dr. Karges. “Glycemic control is not permanently improved in the event that treatment is started early,” she concluded.
“Type 1 diabetes can be delayed with an immune intervention, but to do so, we must also accept possible severe side effects in an otherwise healthy child,” she said. On the other hand, type 1 diabetes can be treated well. “With pumps and continuous glucose monitoring, insulin therapy in children and adolescents has become significantly safer and more effective,” she said.
New therapeutic options
Whether voluntary screening for type 1 diabetes eventually finds its way into standard care depends on the further development of preventive medications. Dr. Ziegler stressed that future preventive therapy does not need to be limited to the anti-CD3 antibody teplizumab.
For example, strategies such as high-dose oral insulin therapy are being investigated. Verapamil, which is used to treat hypertension, is also promising, since with it, beta cells were retained in early stage 3, and it improved their function. The fusion protein abatacept fell short of statistical significance in a recently published study. For Dr. Ziegler, one thing remains true. “The therapy of type 1 diabetes is about to undergo a renaissance.”
This article was translated from the Medscape German Edition. A version of this article appeared on Medscape.com.