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Carcinoid-associated ectopic ACTH syndrome with variable response to octreotide
1Department of Diabetes and Endocrinology, University Hospital, Aintree, Liverpool, UK.
Postgraduate Medical Journal
|August 17, 1999
Summary
A rare case of Cushing's syndrome in a woman was caused by a metastatic carcinoid tumor. Liver transplantation offered initial success, but variable octreotide response highlights treatment challenges.
Area of Science:
- Endocrinology
- Surgical Oncology
- Gastroenterology
Background:
- Cushing's syndrome can arise from neuroendocrine tumors, presenting complex diagnostic and therapeutic challenges.
- Metastatic carcinoid tumors, particularly from pancreatic origins, can secrete hormones leading to severe systemic effects.
Observation:
- A 31-year-old woman presented with severe Cushing's syndrome due to a metastatic hepatic carcinoid tumor.
- Initial management included metyrapone and ketoconazole for hypercortisolaemia, with limited efficacy of high-dose octreotide on tumor markers and growth.
- Liver transplantation provided temporary biochemical normalization and symptom relief.
Findings:
- Tumor recurrence 10 months post-transplantation led to symptomatic elevations in cortisol and 5-hydroxyindole acetic acid (5HIAA).
- Remarkably, octreotide demonstrated biochemical normalization during relapse, contrasting with its prior ineffectiveness.
- This variable response suggests potential alterations in somatostatin receptor expression or cyclical tumor secretory activity.
Implications:
- Liver transplantation is a potential, albeit complex, treatment option for select cases of hormone-secreting metastatic neuroendocrine tumors.
- The fluctuating efficacy of octreotide underscores the need for personalized treatment strategies and further research into somatostatin analog resistance mechanisms.
- This case highlights the intricate interplay between tumor biology, receptor dynamics, and therapeutic response in managing metastatic carcinoid syndrome.