The treatment for Cushing's syndrome depends on the underlying cause of the condition, with the primary goal being to reduce the excessive levels of cortisol in the body.
Addressing Medication-Induced Cushing's Syndrome If the syndrome is caused by the use of prescribed corticosteroid medications, the most effective treatment is to carefully taper off and eventually stop the medication under medical supervision. It is critical to decrease the dosage slowly to allow the body's internal cortisol production to recover, and some patients may still require physiological doses of glucocorticoids for life.
Surgical and Radiation Therapies For patients whose condition is caused by endogenous tumors, surgical removal is the first-line treatment whenever possible.
- Pituitary Tumors (Cushing's Disease): The treatment of choice is the surgical removal of the ACTH-secreting pituitary adenoma, often through a selective transsphenoidal resection. If surgery is unsuccessful or contraindicated, radiotherapy or focused radiosurgery may be used to destroy the tumor.
- Adrenal Tumors: Adrenocortical tumors are surgically removed, and benign adenomas can often be resected laparoscopically.
- Ectopic ACTH-Producing Tumors: Treatment involves surgically excising the non-pituitary tumors (such as those in the lungs, pancreas, or thyroid) that are producing excess ACTH.
- Bilateral Adrenalectomy: The surgical removal of both adrenal glands is sometimes performed if tumors cannot be found, if they are disseminated, or if previous pituitary surgeries and radiation therapies have failed. Following this procedure, patients require lifelong steroid replacement therapy.
Pharmacological Treatments When surgery is not an option, fails to cure the disease, or while patients are waiting for radiation therapy to take effect, medications can be used to control the disease.
- Steroidogenesis Inhibitors: Drugs such as ketoconazole, metyrapone, osilodrostat, levoketoconazole, and mitotane are used to directly inhibit cortisol production in the adrenal glands. In emergencies with severe, fulminant symptoms, an intravenous anesthetic called etomidate can be administered to rapidly drop serum cortisol levels.
- Glucocorticoid Receptor Antagonists: Mifepristone does not decrease cortisol levels but actively blocks cortisol from binding to its receptors. This medication is particularly useful for controlling metabolic complications like hyperglycemia (high blood sugar) in adult patients who are not surgical candidates.
- Pituitary-Directed Drugs: For recurrent or persistent pituitary tumors, medications that suppress ACTH secretion may be prescribed. These include pasireotide (a somatostatin analog) and cabergoline (a dopamine agonist). Retinoic acid has also shown anti-secretory effects by reducing ACTH synthesis.
Supportive and Symptomatic Care
- Hormone Replacement: Following the removal of pituitary or adrenal adenomas, the remaining normal adrenal tissue is often atrophied and sluggish. Patients generally require postoperative steroid replacement (like hydrocortisone or prednisolone) until normal adrenal function recovers.
- Metabolic and Cardiovascular Management: To combat the severe metabolic imbalances of hypercortisolism, patients may be supported with a high-protein diet and potassium administration. Mineralocorticoid receptor blockers, such as spironolactone or eplerenone, are highly effective in controlling low potassium levels and lowering high blood pressure in these patients.
