Evolution in functionality of a metastatic pancreatic neuroendocrine tumour (pNET) causing Cushing's syndrome: treatment response with chemotherapy.

Abstract:

BACKGROUND:We report the case of a patient who had a non-functional metastatic pancreatic neuroendocrine tumour (pNET), which changed in functionality during the course of the disease. This case demonstrates the effectiveness of conventional cytotoxic chemotherapy in the management of select group of patients with this rare, challenging condition. CASE PRESENTATION:Our patient was a 34 year old man under oncology follow up, diagnosed with a non-functional metastatic pancreatic neuroendocrine tumour treated with a Whipple's procedure two years ago. Despite treatment with somatostatin analogues and sunitinib, a tyrosine kinase inhibitor, he had demonstrated radiological progression of his metastatic disease. He now presented with a short history of Cushing's syndrome. A presumptive diagnosis of a rapidly progressive, metastatic, functional pNET with ectopic ACTH production was made, confirmed biochemically and with liver biopsy. The proliferative index, Ki-67 of 20% of the liver biopsy prompted us to treat him with conventional cytotoxic chemotherapy using streptozocin, 5-fluorouracil and doxorubicin. Prior to its administration clinical and biochemical control of the hypercortisolemic state was achieved with metyrapone. However the clinical, biochemical and radiological response to chemotherapy was so dramatic obviating the need for metyrapone therapy. CONCLUSIONS:Non-functional pNETs may evolve in their clinical and biologic behaviour producing functional hormonal syndromes. Chemotherapy may be an effective therapeutic modality in such circumstances.

journal_name

BMC Endocr Disord

journal_title

BMC endocrine disorders

authors

Rajeev SP,McDougall S,Terlizzo M,Palmer D,Daousi C,Cuthbertson DJ

doi

10.1186/1472-6823-14-70

subject

Has Abstract

pub_date

2014-08-24 00:00:00

pages

70

issn

1472-6823

pii

1472-6823-14-70

journal_volume

14

pub_type

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