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  • 1
    Keywords: POPULATION ; HEALTH ; RISK FACTOR ; BLOOD-PRESSURE ; DISORDERS ; hyperthyroidism ; HYPOTHYROIDISM ; ARTERIAL STIFFNESS ; SUBCLINICAL THYROID-DYSFUNCTION ; ENDOTHELIUM-DEPENDENT VASODILATATION
    Abstract: Background: Recent data from a population-based study in children and adolescents suggest that serum thyrotropin (TSH) levels are associated with arterial blood pressure and hypertension. These results are in agreement with some but not all population-based studies in adults. Discrepancies in results might be explained by drug intake, different iodine supplies, and sizes of populations investigated. In addition, it is not clear whether an association between TSH and hypertension exists longitudinally or only cross-sectionally. Thus, our aim was to investigate cross-sectional and longitudinal associations between thyroid function and arterial blood pressure in a large consortium of cohort studies in adults. Methods: Data from five population-based studies were pooled resulting in 17,023 individuals being available for cross-sectional and 10,048 individuals for longitudinal analyses. Associations of baseline TSH with baseline blood pressure or hypertension were analyzed by multivariable median or logistic regression models. Multivariable median or Poisson regression models were used to investigate associations of baseline TSH with five-year change in arterial blood pressure or incident hypertension. Results: There was a cross-sectional positive association of TSH with arterial blood pressure (p〈0.001) and hypertension (odds ratio [OR]=1.76 [confidence interval (CI) 1.24-2.50], p=0.002). Likewise, hypothyroidism was associated with systolic (beta=1.1 [CI 0.1-2.1], p=0.040) and diastolic blood pressure (beta=1.4 [CI 0.7-2.0], p〈0.001). TSH, however, was not consistently associated with a five-year change in blood pressure or incident hypertension. Conclusions: High serum TSH levels were associated with current hypertension and blood pressure but not with a five-year change in blood pressure and incident hypertension. This argues for only a short-term effect of thyroid hormone levels on arterial blood pressure or a spurious association that needs further evaluation in population-based studies.
    Type of Publication: Journal article published
    PubMed ID: 23427935
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  • 2
    Keywords: RISK-FACTORS ; CARDIOVASCULAR-DISEASE ; INSULIN SENSITIVITY ; GENERAL-POPULATION ; OBESE WOMEN ; THYROID-STIMULATING HORMONE ; REFERENCE RANGE ; SUBCLINICAL HYPOTHYROIDISM ; EUTHYROID SUBJECTS ; TSH LEVEL
    Abstract: Background: Population-based studies investigating the sex-specific association between thyrotropin (TSH) levels and serum lipid concentrations are scarce. We examined the association between TSH and total cholesterol, low-density lipoprotein (LDL) cholesterol, high-density lipoprotein (HDL) cholesterol, and triglycerides in men and women from the general population. Furthermore, the association with TSH outside and within the reference range and lipid levels was studied. Methods: Individual data of 13,571 men and women without lipid medication of four population-based studies conducted in Western European adults were pooled for cross-sectional analyses. The association between TSH levels and lipid concentrations were analyzed by calculating sex-specific multivariable median regression models. Results: In the pooled population, serum TSH levels were significantly positively associated with triglyceride values in men and with total cholesterol, LDL cholesterol, and triglyceride values in women. In the pooled male population, low serum TSH levels (〈3.0 mIU/L) were significantly associated with lower total cholesterol, while high serum TSH levels (〉= 3.0 mIU/L) were associated with higher triglyceride values. In the pooled female population, low serum TSH levels were significantly associated with lower total cholesterol, LDL cholesterol, and HDL cholesterol. High TSH levels were associated with higher total cholesterol and LDL cholesterol in the pooled female population. In both sexes, serum TSH levels within the reference range (0.3-3.0 mIU/L) were significantly positively associated with triglyceride concentrations. Conclusions: Increasing levels of TSH were associated with a less favorable lipid profile in both men and women from the general population. In both sexes, TSH levels within the reference range were significantly positively associated with triglyceride concentrations.
    Type of Publication: Journal article published
    PubMed ID: 24102572
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  • 3
    Keywords: CANCER ; MONOCLONAL-ANTIBODY ; ACTIVATION ; IMPACT ; ASSOCIATION ; METASTATIC MELANOMA ; RECURRENCE ; CLINICAL-IMPLICATIONS ; TARGETED THERAPY ; BRAF V600E MUTATION
    Abstract: BACKGROUND: The aim of this study was to compare the detection of BRAF(V600E) by immunohistochemistry (IHC) using a mutation-specific antibody with molecular biology methods for evaluation of papillary thyroid carcinoma (PTC) patients. PATIENTS AND METHODS: This study concerned 198 consecutive conventional PTC patients, of which the majority were women (133/198; 67%), with a mean age of 56 years (range 19-79 years). BRAF mutation analysis was performed using DNA-based (direct sequencing, pyrosequencing, and SNaPshot) and IHC (VE1 antibody) methods. The sensitivity and specificity of IHC for BRAF(V600E) was compared with the molecular biology data. RESULTS: A BRAF mutational result was obtained in 194 cases. A BRAF(V600E) mutation was detected in 153/194 (79%) cases of PTC when using at least one molecular method, and in 151/194 (78%) cases with IHC. No false positive results were noted using IHC to detect the BRAF(V600E) mutation. Besides this mutation, other rare BRAF mutations (BRAF(V600K) and BRAF(K601E)), used as negative controls, were consistently negative with IHC. The sensitivity and specificity of IHC for the detection of this mutation were 98.7% and 100% respectively. The IHC test demonstrated excellent performance at a level equivalent to two DNA-based counterparts (pyrosequencing and SNaPshot). Failure to achieve a result was more frequent with the direct sequencing method than with the three other methods. CONCLUSION: IHC using the VE1 antibody is a specific and sensitive method for the detection of the BRAF(V600E) mutation in PTC. IHC may be an alternative to molecular biology approaches for the routine detection of this mutation in PTC patients.
    Type of Publication: Journal article published
    PubMed ID: 24417277
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  • 4
    Abstract: CONTEXT: Except from associations study with body weight, there are few longitudinal data regarding the association between thyroid function and anthropometric such as waist circumference, waist-to-hip-ratio or waist-to height-ratio. OBJECTIVE: We aimed at investigating the association of thyroid stimulating hormone (TSH) at baseline with changes in different anthropometric markers between baseline and follow-up in the general population. DESIGN AND SETTING: We used data from four population-based longitudinal cohort studies and one population-based cross-sectional study. SUBJECTS: We studied 16,902 (8,204 males and 8,698 females) subjects aged 20 to 95 years from the general population. MAIN OUTCOME MEASURES: We measured body mass index, waist-circumference, waist-to-hip- ratio and waist-to-height-ratio. Multivariable median regression models were calculated adjusting for the following covariates: age, sex, baseline value of the respective anthropometric marker, smoking status, follow-up-time period and study site. RESULTS: In cross-sectional analyses, serum TSH within the reference range was positively associated with waist circumference (beta 0.94 cm (95%CL 0.56; 1.32)) and waist-to-height-ratio (beta 0.029 (95%CL 0.017; 0.042)). These associations were also present for the full range of TSH. In the longitudinal analyses, serum TSH at baseline was inversely associated with 5-year change of all considered anthropometric measures within the prior defined study-specific reference range, as well as in the full range of serum TSH. CONCLUSION: High TSH serum levels were positively associated with current anthropometric markers even in the study-specific reference ranges. In contrast, high TSH serum levels were associated with decreased anthropometric markers over a time span of approximately 5 years. Further research is needed to determine possible clinical implications as well as public health consequences of these findings.
    Type of Publication: Journal article published
    PubMed ID: 27393002
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