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Fugitive Acromegaly: A Historical, Clinical, and Translational Perspective.

Roberto Toni1,2,3,4, Fulvio Barbaro5, Giusy Di Conza5

  • 1Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism, Tufts Medical Center - Tufts University School of Medicine, Boston, Massachusetts, USA.

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Fugitive acromegaly involves aggressive pituitary tumors with subtle symptoms. Understanding tumor types like ASCTs and SGSTs aids diagnosis and treatment strategies for these rare conditions.

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Area of Science:

  • Endocrinology
  • Neuro-oncology
  • Molecular Biology

Background:

  • Fugitive acromegaly describes pituitary tumors with subtle signs of somatotroph hyperfunction and pituitary insufficiency.
  • These tumors, classified as acidophil stem cell tumors (ASCTs) or sparsely granulated somatotroph tumors (SGSTs), are locally invasive and prone to relapse.
  • ASCTs are characterized by estrogen receptor alpha (ERα) expression, predominant prolactin (PRL) release, and less abundant growth hormone (GH), often showing resistance to dopamine agonists.
  • SGSTs typically present with elevated GH and IGF1 but rarely increased PRL, and are often resistant to somatostatin analogues.

Purpose of the Study:

  • To elucidate the characteristics and underlying mechanisms of aggressive pituitary tumors causing fugitive acromegaly.
  • To differentiate between ASCTs and SGSTs based on hormonal profiles and treatment responses.
  • To explore the potential role of molecular pathways in the development of these aggressive tumors.

Main Methods:

  • Review of clinical presentations, hormonal profiles, and tumor characteristics of patients with fugitive acromegaly.
  • Analysis of differential diagnosis for pituitary tumors, including mammosomatotroph and mixed GH-/PRL-secreting tumors.
  • In vitro studies using rat tumoral mammosomatotroph cell lines (GH3, GH4C1) to investigate molecular mechanisms.

Main Results:

  • ASCTs express ERα, predominantly release PRL, and are resistant to dopamine agonists, often treated with somatostatin analogs.
  • SGSTs show increased GH and IGF1, rarely increased PRL, and are treated with pegvisomant due to resistance to somatostatin analogues.
  • In vitro studies suggest chaperone overexpression in immature PIT1-/ERα-expressing progenitors may lead to posttranscriptional changes in tumor suppressors (e.g., AIP), contributing to aggressive tumor development.

Conclusions:

  • Accurate classification of pituitary tumors, distinguishing between ASCTs and SGSTs, is crucial for effective treatment selection.
  • Understanding the molecular underpinnings, including the role of ERα and chaperones, is key to developing targeted therapies for aggressive pituitary tumors.
  • Further research into the pathways involved in fugitive acromegaly may reveal novel therapeutic targets.