Endocrine Abstracts

Purpose: MicroRNAs (miRNAs) are a fundamental component of gene regulation mechanisms. Presently, altered miRNA patterns of expression have been documented in different human cancers, and they may explain the distinct behavior of pituitary adenomas (PA) and the differences between subtypes. miR-375 can target among other genes to IGF1 receptor (IGF1R) and participes in reprogramming cancer cell metabolism. The aim of this study was to assess the miR-375 role on pathogenesis of...

Purpose: The 2004 edition of the WHO text ‘Histological typing of endocrine tumors’ classified pituitary adenomas (PA) on the basis of their histological and immunohistochemical characteristics. Recent advances on the knowledge of the molecular patterns of these tumours may allow establishing a molecular classification with higher accuracy and specificity than previous one.Methods: Within the pale of the multicenter Spanish Molecular Registry o...

Purpose: IGF receptor 1 (IGF1R) and epidermal growth factor receptor (EGFR) are receptors tyrosine-kinase (RTK) whose altered signaling are critical factors in development of many types of tumours. These RTK are some of the main targets of the microRNA miR-7. This important tumor supressor miRNA has the ability to inhibit the motility, invasiveness and anchorage-independent growth, suggesting a strong therapeutic potential in many types of cancer. Pituitary adenomas (PA) are a...

Introduction: Sleep disordered breathing (SDB) promotes structural myocardial changes and can trigger cardiac arrhythmias. Acromegalic patients have high prevalence of SDB and GH–IGF1 excess is related to a specific cardiomyopathy characterized by concentric cardiac hypertrophy and diastolic dysfunction. The aim of this study was to assess the relationship between SDB and cardiac dysfunction on acromegalic patients.Material and methods: Observationa...

Silent corticotroph tumors (SCT) represent a distinct subtype of pituitary tumors (PT) known for their potential aggressiveness, surpassing other silent PTs like gonadotroph tumors (SGT). Despite their aggressive clinical behavior, the mechanisms underlying their aggressiveness remain unclear. Recent studies in various cancers, such as breast cancer, have implicated the IGF1 axis in the presence of metastases. This study aims to investigate some components of the somatotroph a...

Introduction: Hypophysitis, an infrequent inflammatory condition of the pituitary gland, is typically managed with glucocorticoids, reserving surgery for significant mass effects and considering immunosuppressants or radiotherapy for refractory cases. Recent reports indicate positive outcomes with immunosuppressants. Here, we present a case of recurrent xanthogranulomatous hypophysitis in a 16-year-old female successfully treated with Rituximab.Case Repo...

Corticotroph tumours, comprising around 15% of pituitary tumours, express ACTH and other peptides originating from TPIT-lineage adenohypophyseal cells. Their tumorigenesis involves a complex interplay of genetic and epigenetic factors and hormonal and growth factor stimulation. Silent corticotroph tumours (SCT) share immunopositivity for ACTH and TPIT with functioning corticotroph tumours (FCT) but do not exhibit evidence of hypercortisolism. Despite their aggressive growth an...

Introduction: The immunohistochemical characterization of Pit-1, Tpit and SF-1 transcription factors allows the identification of the three adenohypophyseal cell lines and has been incorporated into the latest WHO classification of pituitary adenomas (PA). The aim of the present study was to quantify the protein expression of pituitary-specific transcription factors (TF) by immunohistochemistry (IHC) and to correlate these results with the identification based on hormonal prot...

Surgical factors, in particular a higher volume of operations and a dedicated neurosurgeon, are considered the main determinants of surgical complication rates in transsphenoidal surgery (TSS). We evaluated postoperative complications in a large series of TSS for non-producing adenomas included in TESSPAIN, a retrospective multicenter nationwide registry. All TSS performed at the 29 participating centers between 2018 and 2022 were included. Globally, 1421 non-producing pituita...

Transsphenoidal surgery (TSS) of the hypothalamic-pituitary region is the approach of choice because of its lower morbidity compared to the transcranial approach. However, its results are highly variable and depend on many factors related to the tumor itself, to the medical team, and to technical issues. We review the situation of this procedure in a nationwide retrospective multicenter evaluation. Data were collected from centers participating in the TESSPAIN (TranssphEnoidal...