Which drug class is used to suppress growth hormone secretion in GH-secreting pituitary adenomas?

Which drug class is used to suppress growth hormone secretion in GH-secreting pituitary adenomas?

• A. Octreotide
• B. Cabergoline
• C. Hydrocortisone
• D. Levothyroxine

Answer: (A)

Somatostatin analogs are used to suppress growth hormone secretion from GH-secreting pituitary adenomas. They mimic the natural inhibitory hormone somatostatin and bind to somatostatin receptors on pituitary somatotrophs, which directly decreases GH release. Lowering GH reduces downstream IGF-1 levels and helps control symptoms and tumor growth. Octreotide is a prototypical drug in this class and is commonly used when surgery isn’t fully curative or as an adjunct therapy. Cabergoline, a dopamine agonist, can modestly reduce GH in some patients but is not as effective or reliably suppressive as somatostatin analogs. Hydrocortisone and levothyroxine are hormone replacements and do not suppress GH secretion.

Somatostatin analogs are used to suppress growth hormone secretion from GH-secreting pituitary adenomas. They mimic the natural inhibitory hormone somatostatin and bind to somatostatin receptors on pituitary somatotrophs, which directly decreases GH release. Lowering GH reduces downstream IGF-1 levels and helps control symptoms and tumor growth. Octreotide is a prototypical drug in this class and is commonly used when surgery isn’t fully curative or as an adjunct therapy.

Cabergoline, a dopamine agonist, can modestly reduce GH in some patients but is not as effective or reliably suppressive as somatostatin analogs. Hydrocortisone and levothyroxine are hormone replacements and do not suppress GH secretion.