Daily Endocrinology Research Analysis
Analyzed 59 papers and selected 3 impactful papers.
Summary
Analyzed 59 papers and selected 3 impactful articles.
Selected Articles
1. Genetic drivers of etiologic heterogeneity in thyroid cancer.
A multi-ancestry GWAS meta-analysis of 16,167 thyroid cancer cases and 2.43 million controls identified 51 independent loci (21 novel) and organized risk into mechanistic clusters tied to thyroid function, DNA repair, and telomere maintenance. Cluster-specific polygenic scores associated with thyroid disease and metabolic traits across ancestries, supporting pleiotropy-based risk stratification.
Impact: This study reframes thyroid cancer susceptibility into biologically coherent clusters and delivers 21 new loci, advancing mechanistic understanding and enabling refined genetic risk stratification.
Clinical Implications: Cluster-specific polygenic scores and pathway insights may inform individualized surveillance and prevention strategies, and highlight targets (DNA repair, telomere biology) for therapeutic exploration.
Key Findings
- Identified 51 independent risk loci for thyroid cancer, including 21 novel signals.
- Pleiotropic clusters linked to thyroid-stimulating hormone biology, thyroid growth/function, oncogenic DNA repair (ATM, CHEK2, TP53), and telomere maintenance (TERT).
- Cluster-specific polygenic scores associated with thyroid disease, cancer, and metabolic traits across ancestries.
- Thyroid-specific clusters showed tissue enrichment in thyroid tissues, supporting biological plausibility.
Methodological Strengths
- Large multi-ancestry GWAS meta-analysis (16,167 cases; 2,430,374 controls).
- Integrated pleiotropy analyses across 151 traits, tissue enrichment, and cluster-specific polygenic scores.
Limitations
- Observational genetic associations cannot establish causality; effect sizes per variant are small.
- Potential ancestry-specific heterogeneity and phenotype definition differences across cohorts.
Future Directions: Functional validation of cluster-specific genes, development of clinically actionable polygenic risk tools, and prospective evaluation of risk-tailored surveillance.
Thyroid cancer is the most common endocrine malignancy, yet its biological underpinnings remain incompletely understood. Here we show that common risk alleles for thyroid cancer point to distinct biological pathways underlying disease susceptibility. We perform a multi-ancestry genome-wide association meta-analysis of thyroid cancer (16,167 cases and 2,430,374 controls), identifying 51 independent loci, including 21 not previously reported. By integrating these loci with genetic associations for 151 thyroid-cance
2. Premeal insulin administration lowers postprandial blood glucose and increases myocardial microvascular blood flow in people with type 1 diabetes: a randomised, crossover clinical trial.
In a randomized, crossover study of young adults with type 1 diabetes, premeal (vs postmeal) insulin significantly reduced postprandial glucose exposure and increased myocardial microvascular flow velocity and myocardial microvascular blood flow. Vital signs were unchanged across protocols.
Impact: It links a simple, implementable behavioral change—premeal bolusing—to improved myocardial microvascular perfusion, connecting glycemic timing with cardiovascular physiology.
Clinical Implications: Reinforces counseling on premeal insulin bolusing in type 1 diabetes to reduce postprandial hyperglycemia and potentially enhance myocardial microvascular perfusion.
Key Findings
- Premeal insulin lowered postprandial glucose area under the curve vs postmeal dosing (p=0.015).
- Premeal insulin increased myocardial microvascular flow velocity (p=0.031) and myocardial MBF (p=0.044) in type 1 diabetes.
- No significant changes in myocardial MBF were observed in other control protocols; vital signs remained similar across conditions.
Methodological Strengths
- Randomized, crossover design minimizes inter-individual confounding.
- Direct vascular assessment of myocardial microvascular perfusion alongside glycemic profiling.
Limitations
- Small sample size and short-term, single-center physiologic study limit generalizability.
- Young, relatively healthy cohort may not represent older or comorbid populations.
Future Directions: Evaluate long-term cardiovascular outcomes and applicability across diverse age groups, diabetes durations, and insulin delivery modalities (MDI vs AID/CSII).
AIMS/HYPOTHESIS: We aimed to evaluate whether prandial insulin timing affects vascular function in people with type 1 diabetes. Our hypothesis was that premeal insulin administration would lead to greater myocardial microvascular blood flow (MBF) via blunting postprandial hyperglycaemia. METHODS: People with type 1 diabetes between 18 and 35 years of age with BMI <30 kg/m RESULTS: Eighteen people with type 1 diabetes and 18 matched control participants were analysed within each protocol. Glucose area under the curve was significantly greater (p=0.015) in the postmeal insulin study compared with the premeal insulin study in participants with type 1 diabetes. Myocardial microvascular flow velocity significantly increased (p=0.031) with premeal insulin administration in people with type 1 diabetes and this consequently led to greater myocardial MBF (p=0.044). There were no changes in myocardial MBF within the other protocols. Changes in vital signs were similar between all protocols. CONCLUSIONS/INTERPRETATION: Appropriately timed premeal insulin led to lower postprandial blood glucose along with increased myocardial MBF in people with type 1 diabetes. Further work is needed to determine the underlying aetiology of these changes. TRIAL REGISTRATION: ClinicalTrials.gov NCT04730882.
3. Cardiovascular risk associated with intellectual disability among adults with type 2 diabetes: a nationwide cohort study in South Korea.
In a nationwide cohort of over 2 million adults with type 2 diabetes, intellectual disability was associated with a 72% higher risk of incident cardiovascular disease versus no disability, exceeding the risk associated with other disabilities. The excess risk was particularly notable for ischemic stroke.
Impact: This very large, real-world cohort quantifies a substantial, inequitable cardiovascular risk burden in a vulnerable subgroup, informing targeted prevention and policy.
Clinical Implications: Clinicians should prioritize aggressive cardiovascular risk assessment and prevention in adults with type 2 diabetes and intellectual disability, including stroke-focused strategies and tailored care pathways.
Key Findings
- Nationwide T2D cohort (n=2,062,821) with median 5.9-year follow-up identified 111,450 incident CVD events.
- Intellectual disability was associated with higher incident CVD risk vs no disability (HR 1.72; 95% CI 1.52-1.94) and exceeded non-ID disabilities (HR 1.35; 95% CI 1.33-1.37).
- Excess risk was especially pronounced for ischemic stroke.
Methodological Strengths
- Very large, nationwide, population-based cohort with standardized disability classification and robust Cox modeling.
- Exclusion of prior CVD and early events reduces reverse causation; long median follow-up.
Limitations
- Observational design limits causal inference; residual confounding (e.g., socioeconomic, care access) may persist.
- CVD definitions rely on administrative codes; stroke subtyping and treatment data were not detailed.
Future Directions: Interventional studies to test targeted CVD prevention bundles in T2D with ID, and mechanistic work on stroke susceptibility in this population.
BACKGROUND: Individuals with intellectual disability (ID) are at elevated risk for cardiovascular disease (CVD), a vulnerability compounded by coexisting type 2 diabetes (T2D). We evaluated the extent to which ID is associated with incident CVD by directly comparing ID with both non-ID disabilities and no disabilities. METHODS: We conducted a nationwide, population-based cohort study of adults with T2D (aged ≥20 years) in South Korea, with health screenings between January 1, 2015, and December 31, 2016, and follow-up until December 31, 2022 (median 5.9 years). Individuals with a prior myocardial infarction (MI) or ischemic stroke, missing covariates, or a cardiovascular event within the first year of follow-up were excluded. Disability was classified as ID, non-ID disabilities, or no disabilities using the Korea National Disability Registration System. The primary outcome was incident CVD, defined as MI (ICD-10: I21-22) or ischemic stroke (ICD-10: I63-64), assessed throughout follow-up. Hazard ratios (HRs) with 95% confidence intervals (CIs) were estimated using Cox proportional hazards models. FINDINGS: Of 2,062,821 adults with T2D, 4574 (0.22%) had ID, 173,350 (8.4%) had non-ID disabilities, and 1,884,897 (91.4%) had no disabilities, and 111,450 incident CVD events were recorded during follow-up. The ID group had the highest CVD risk compared to those with no disabilities (HR 1.72; 95% CI 1.52-1.94), substantially exceeding non-ID disabilities (HR 1.35; 95% CI 1.33-1.37; INTERPRETATION: ID is associated with a substantially greater CVD risk burden in adults with T2D than other disabilities, particularly for ischemic stroke. Future studies are needed to evaluate long-term cardiovascular trajectory and targeted prevention strategies in this population. FUNDING: This work was supported by the Ministry of Education of the Republic of Korea and the National Research Foundation of Korea (including G-LAMP Program).