Mandatory notifications of type 1 diabetes incident cases in Chilean children, 2006 to 2014: A population-based study

The increase in diabetes in children from underdeveloped countries

PURPOSE OF REVIEW

The incidence of type 1 diabetes (T1D) in children and adolescents has been increased over decades worldwide. Recent studies showed that the trend of T1D incidences were different between developed and underdeveloped countries. This review aimed to summarize the changes of childhood T1D incidences in underdeveloped countries over the past decade.

RECENT FINDINGS

Majority of the underdeveloped countries lacked of nationwide population-based studies on childhood T1D. We reviewed the trend of childhood T1D in important underdeveloped countries with available data in recent years. The incidences of childhood T1D in underdeveloped countries were low decades ago, but it increased significantly recently, particularly in the sub-Saharan African, Middle East and North African regions.

SUMMARY

The incidences of childhood T1D increased significantly in underdeveloped countries, especially in the sub-Saharan African, Middle East and North African regions. T1D registry and population-based studies are helpful to understand the situation and characteristic of childhood T1D in underdeveloped countries.

Incidence of type 1 diabetes in Chilean children between 2006 and 2021: significant increase during the COVID-19 pandemic

AIMS

An increase in type 1 diabetes (T1D) incidence has been observed in several countries during the COVID-19 pandemic. The objective of this study is to determine T1D incidence trends in Chilean children between 2006 and 2021, and specifically evaluate the effect of the COVID-19 pandemic in this population.

METHODS

We reviewed mandatory notifications of T1D in Chile's public and private health system in youth < 20 years between 2006 and 2021, and compared COVID-19 pre-pandemic and pandemic incidence.

RESULTS

In Chile, 9472 new T1D cases in children were confirmed between 2006 and 2021. The mean annual T1D incidence in the entire period was 12.7/100,000 inhabitants, with an incidence of 11.7/100,000 between 2006 and 2019 vs. 20.2/100,000 during 2020-2021 (β = 0.691, [95%CI 0.479-0903], p < 0.001.) The highest incidence was observed in the 10-14 years age group, but a significant increasing incidence was observed in all age groups. The second year of the COVID-19 pandemic, 2021, had the highest incidence rate of the study period. While a 5% mean annual increase was observed between 2006 and 2019, in 2021 the T1D incidence jumped 28.5% compared with the two previous years. We found a higher T1D incidence in population with private insurance than public insurance (14.8 vs. 11.7/100.000, respectively, RR = 1.26 [95%CI 1.03-1.53], p < 0.027).

CONCLUSIONS

T1D incidence rates in Chilean youth doubled between 2006 and 2018, subsequently presenting a striking increase during the COVID-19 pandemic.

Incidence of type 1 diabetes in children in Dominican Republic, 2010-2019: A national collaborative study

The Dominican Republic has no recent data on type 1 diabetes (T1D) incidence in children. Therefore, a study was undertaken to determine this in persons aged <15 years (y). Data were collected on all new T1D diagnoses between 2010-2019 from the four institutions caring for children with T1D. Diagnosis was made according to standard criteria. No secondary ascertainment source was available. The trend and the effect of age and sex of T1D incidence was analyzed using Poisson regression. A total of 1224 new cases of T1D were diagnosed <15 y; mean ± standard deviation (range) 122 ± 12 (96-135) cases per year. Age at T1D diagnosis was 8.8 ± 3.7 y, with a significant female preponderance (n = 708, 57.8%, p < 0.001). When examined per 5-y age group, cases were consistently highest in 10-14 y, and lowest in 0-4 y in all study years. Mean crude T1D annual incidence was 4.3 (95% CI 3.5-5.1) per 100,000 population. There was no significant difference between incidence across the country's three departments (regions): Southeast (4.4 [3.4-5.7]/100,000 population), North (4.1 [2.9-5.6]), and Southwest (3.9 [2.4-5.9]). Mean standardized annual incidence was 4.1 (4.1-4.2) per 100,000 population, with no significant trend of increase over the study period. The incidence of T1D in children aged <15 y is relatively low in Dominican Republic, but consistent with the limited data from other countries in the region. However, the incidence is eight times higher than the previous estimate during 1995-1999. Ongoing surveillance is warranted.

Urinary Extracellular Vesicles as a Source of NGAL for Diabetic Kidney Disease Evaluation in Children and Adolescents With Type 1 Diabetes Mellitus

BACKGROUND

Tubular damage has a role in Diabetic Kidney Disease (DKD). We evaluated the early tubulointerstitial damage biomarkers in type-1 Diabetes Mellitus (T1DM) pediatric participants and studied the correlation with classical DKD parameters.

METHODS

Thirty-four T1DM and fifteen healthy participants were enrolled. Clinical and biochemical parameters [Glomerular filtration Rate (GFR), microalbuminuria (MAU), albumin/creatinine ratio (ACR), and glycated hemoglobin A1c (HbA1c)] were evaluated. Neutrophil gelatinase-associated lipocalin (NGAL), Hypoxia-inducible Factor-1α (HIF-1α), and Nuclear Factor of Activated T-cells-5 (NFAT5) levels were studied in the supernatant (S) and the exosome-like extracellular vesicles (E) fraction from urine samples.

RESULTS

In the T1DM, 12% had MAU >20 mg/L, 6% ACR >30 mg/g, and 88% had eGFR >140 ml/min/1.72 m². NGAL in the S (NGAL-S) or E (NGAL-E) fraction was not detectable in the control. The NGAL-E was more frequent (p = 0.040) and higher (p = 0.002) than NGAL-S in T1DM. The T1DM participants with positive NGAL had higher age (p = 0.03), T1DM evolution (p = 0.03), and serum creatinine (p = 0.003) than negative NGAL. The NGAL-E correlated positively with tanner stage (p = 0.0036), the median levels of HbA1c before enrollment (p = 0.045) and was independent of ACR, MAU, and HbA1c at the enrollment. NFAT5 and HIF-1α levels were not detectable in T1DM or control.

CONCLUSION

Urinary exosome-like extracellular vesicles could be a new source of early detection of tubular injury biomarkers of DKD in T1DM patients.