Publications by authors named "Steven J Hunter"

Article Synopsis
  • Pituitary neuroendocrine tumors have a Ki-67 proliferation index that can change based on how many tumor cells are examined.
  • There are ongoing debates about the best ways to score Ki-67, highlighting the need for consistent assessment methods.
  • A re-evaluation of the current 3% cut-off for Ki-67 is necessary to resolve these controversies in assessing tumor proliferation.
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Cushing's disease is a rare condition that occurs due to an adrenocorticotrophin-producing corticotrophinoma arising from the pituitary gland. The consequent hypercortisolaemia results in multisystem morbidity and mortality. This study aims to report incidence, clinicopathological characteristics, remission outcomes and mortality in a regional pituitary neurosurgical cohort of patients diagnosed with Cushing's disease in Northern Ireland (NI) from 2000 to 2019.

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Context: Head and neck paragangliomas (HNPGLs) are rare, usually benign, slow-growing tumours arising from neural crest-derived tissue. Definitive management pathways for HNPGLs have yet to be clearly defined.

Objective: To review our experience of the clinical features and management of these tumours and to analyse outcomes of different treatment modalities.

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Article Synopsis
  • The study aims to improve the understanding of non-functioning pituitary microadenomas (micro-NFPAs) and their natural progression to inform patient care.
  • Conducted across 23 endocrine departments in the UK, it analyzed clinical data from 459 patients over a median of 3.5 years, assessing tumor growth and hormonal changes.
  • Results indicate a low probability of tumor growth (7.8% at 3 years) and rare development of hypopituitarism, suggesting that follow-up MRIs every 3 years and less frequent hormonal checks are adequate for managing micro-NFPAs.
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Background: Central diabetes insipidus is a rare neuroendocrine condition. Data on treatment-associated side-effects, psychological comorbidities, and incorrect management are scarce. The aim of this study was to investigate patients' perspectives on their disease.

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Pituitary neuroendocrine tumours (PitNETs) associated with paragangliomas or phaeochromocytomas are rare. SDHx variants are estimated to be associated with 0.3-1.

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Background: Observational studies have suggested an inverse association between low serum 25-hydroxyvitamin D [25(OH)D] concentrations and development of type 2 diabetes. High-quality trials are required to test the hypothesis that vitamin D is a direct contributor to type 2 diabetes pathogenesis.

Objective: The purpose of this double-blind randomized placebo-controlled trial was to investigate the effect of vitamin D3 supplementation on insulin resistance (IR) and β-cell function in people with prediabetes and suboptimal vitamin D status (<50 nmol/L).

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Pregnancy in acromegaly is rare and generally safe, but tumour expansion may occur. Managing tumour expansion during pregnancy is complex, due to the potential complications of surgery and side effects of anti-tumoural medication. A 32-year-old woman was diagnosed with acromegaly at 11-week gestation.

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Adoption of a Mediterranean diet (MD) reduces cardiovascular disease (CVD) risk. However, interventions to achieve dietary behaviour change are typically resource intensive. Peer support offers a potentially low-cost approach to encourage dietary change.

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The aryl hydrocarbon receptor interacting protein (AIP) founder mutation R304 (or p.R304 ; NM_003977.3:c.

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Aim. The purpose of this study was to develop and evaluate a computer-based, dietary, and physical activity self-management program for people recently diagnosed with type 2 diabetes. Methods.

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Since Darwin, biologists have come to recognize that the theory of descent from common ancestry (CA) is very well supported by diverse lines of evidence. However, while the qualitative evidence is overwhelming, we also need formal methods for quantifying the evidential support for CA over the alternative hypothesis of separate ancestry (SA). In this article, we explore a diversity of statistical methods using data from the primates.

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Article Synopsis
  • Orchids are the largest family of flowering plants, comprising over 25,000 species, surpassing mammals, birds, and reptiles combined.
  • A comprehensive phylogenetic analysis based on 75 chloroplast genes across various orchid subfamilies and tribes reveals that orchids emerged around 112 million years ago, with different groups diverging at various times throughout their evolutionary history.
  • Factors like the development of pollination strategies and unique growing habits contributed to significant accelerations in species diversification within orchids, with deceit pollination notably increasing species numbers without affecting overall diversification rates.
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Background: Web-based programs are a potential medium for supporting weight loss because of their accessibility and wide reach. Research is warranted to determine the shorter- and longer-term effects of these programs in relation to weight loss and other health outcomes.

Objective: The aim was to evaluate the effects of a Web-based component of a weight loss service (Imperative Health) in an overweight/obese population at risk of cardiovascular disease (CVD) using a randomized controlled design and a true control group.

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Background: Clinical and biochemical follow up after surgery for phaeochromocytoma is essential with long term studies demonstrating recurrence frequencies between 6% and 23%.

Aim: To examine the characteristics and frequency of tumour recurrence in a regional endocrine referral centre, in patients with surgical resection of phaeochromocytoma (P) and abdominal paraganglioma (AP).

Methods: We identified a cohort of 52 consecutive patients who attended our Regional Endocrinology & Diabetes Centre and retrospectively reviewed their clinical, biochemical and radiological data (between 2002 and 2013).

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The adaptor protein-2 sigma subunit (AP2σ2) is pivotal for clathrin-mediated endocytosis of plasma membrane constituents such as the calcium-sensing receptor (CaSR). Mutations of the AP2σ2 Arg15 residue result in familial hypocalciuric hypercalcaemia type 3 (FHH3), a disorder of extracellular calcium (Ca(2+) o) homeostasis. To elucidate the role of AP2σ2 in Ca(2+) o regulation, we investigated 65 FHH probands, without other FHH-associated mutations, for AP2σ2 mutations, characterized their functional consequences and investigated the genetic mechanisms leading to FHH3.

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Background: Improving diet and lifestyle is important for prevention of cardiovascular disease (CVD). Observational evidence suggests that increasing fruit and vegetable (FV) consumption may lower CVD risk, largely through modulation of established risk factors, but intervention data are required to fully elucidate the mechanisms by which FVs exert benefits on vascular health.

Objective: The aim of this study was to examine the dose-response effect of FV intake on cardiovascular risk factors in adults at high CVD risk.

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Vitamin D is a steroid hormone, which in active form binds to the vitamin D receptor. Expression of the vitamin D receptor in diverse cell types (pancreatic islet cells, myocytes, hepatocytes and adipocytes) raises the suspicion that vitamin D may be involved in multiple cellular processes, including the response to insulin. Insulin resistance is a characteristic feature of type 2 DM, and its attenuation may reduce the incidence of type 2 DM and cardiovascular disease.

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Dietary pattern (DP) analysis allows examination of the combined effects of nutrients and foods on the markers of CVD. Very few studies have examined these relationships during adolescence or young adulthood. Traditional CVD risk biomarkers were analysed in 12-15-year-olds (n 487; Young Hearts (YH)1) and again in the same individuals at 20-25 years of age (n 487; YH3).

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Our review and meta-analysis examined the association between a posteriori-derived dietary patterns (DPs) and risk of type 2 diabetes mellitus. MEDLINE and EMBASE were searched for articles published up to July 2012 and data were extracted by two independent reviewers. Overall, 19 cross-sectional, 12 prospective cohort, and two nested case-control studies were eligible for inclusion.

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Aims: Assess insulin sensitivity after treatment with a selective PPAR-alpha agonist compared to an HMG CoA reductase inhibitor in human subjects with type 2 diabetes mellitus.

Methods: Thirteen subjects with Type 2 diabetes mellitus were studied in a double-blind crossover design with 4-week placebo run-in and washout and 12-week treatment periods, randomised to micronised fenofibrate 267 mg or atorvastatin 10mg daily followed by the alternate drug in the second period. Insulin resistance was measured using the isoglycaemic hyperinsulinaemic clamp method with isotope dilution.

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Objective: The purpose of this randomized controlled trial was to investigate the dose-response effect of fruit and vegetable (F&V) intake on insulin resistance (IR) in people who are overweight and at high risk of cardiovascular disease (CVD).

Research Design And Methods: A total of 105 participants (mean age 56 years) followed a 4-week washout diet (one to two portions of F&Vs per day). Ninety-two participants completed the washout and were randomized to receive one to two, four, or seven portions of F&Vs per day for 12 weeks.

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Unlabelled: Aim To explore the views of individuals recently diagnosed with type 2 diabetes in relation to self-management of dietary intake and physical activity, and to compare these with the views of health professionals (HPs).

Background: Diabetes education has become a priority area in primary and secondary care, and many education programmes are now embedded within a patient's care package. There are few contemporaneous explorations of patients' views about lifestyle self-management.

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