title: 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.
  
  
  METHODS
  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.
authors.forename: Surya Panicker
authors.initials: SP
authors.lastname: Rajeev
authors.forename: Steffan
authors.initials: S
authors.lastname: McDougall
authors.forename: Monica
authors.initials: M
authors.lastname: Terlizzo
authors.forename: Daniel
authors.initials: D
authors.lastname: Palmer
authors.forename: Christina
authors.initials: C
authors.lastname: Daousi
authors.affiliation: Department of Obesity and Endocrinology, University Hospital Aintree, Liverpool L9 7AL, UK. daniel.cuthbertson@liverpool.ac.uk.
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Cuthbertson
mesh_terms: D000328:Adult; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use*; D003480:Cushing Syndrome / Q000188:drug therapy* / Q000209:etiology / Q000473:pathology; D004317:Doxorubicin / Q000008:administration & dosage; D005472:Fluorouracil / Q000008:administration & dosage; D006801:Humans; D008297:Male; D010190:Pancreatic Neoplasms / Q000150:complications* / Q000473:pathology; D011379:Prognosis; D013311:Streptozocin / Q000008:administration & dosage
chemical_list: D013311:Streptozocin; D004317:Doxorubicin; D005472:Fluorouracil