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Vasoactive intestinal polypeptide and gastrin-producing islet cell carcinoma
Archives of Pathology & Laboratory Medicine
|May 1, 1977
Summary
This study reports a rare case of pancreatic islet cell carcinoma co-secreting vasoactive intestinal polypeptide (VIP) and gastrin, leading to severe symptoms like watery diarrhea and hypokalemia.
Area of Science:
- Endocrinology
- Oncology
- Gastroenterology
Background:
- Pancreatic islet cell tumors can secrete various hormones, leading to distinct clinical syndromes.
- The Verner-Morrison syndrome is characterized by watery diarrhea, hypokalemia, and hypochlorhydria, often associated with VIP-secreting tumors.
Observation:
- A 61-year-old woman presented with watery diarrhea, hypochlorhydria, hypokalemia, and elevated gastrin.
- She was diagnosed with islet cell carcinoma of the pancreas with liver metastases.
Findings:
- Radioimmunoassay and immunofluorescence confirmed the co-secretion of vasoactive intestinal polypeptide (VIP) and gastrin from the tumor and metastases.
- Electron microscopy revealed two distinct cell types within the tumor, each corresponding to one of the secreted hormones.
- Elevated plasma prostaglandin E levels were also noted.
Implications:
- This case highlights the potential for pancreatic islet cell tumors to co-secrete multiple hormones, complicating diagnosis and management.
- The findings underscore the importance of comprehensive hormonal evaluation in patients with unexplained gastrointestinal and electrolyte disturbances.
- Understanding tumor heterogeneity in hormone production is crucial for targeted therapies and improved patient outcomes.