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Pancreatic Neuroendocrine Tumor (PNET)

A heterogeneous group of pancreatic tumors with functional and non-functional behavior and slower growth than ductal adenocarcinoma.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Onkoloji department. Book Appointment →

What is Pancreatic Neuroendocrine Tumor (PNET)?

Pancreatic neuroendocrine tumors (PNETs) account for 1-5% of pancreatic malignancies and arise from islet cells. Incidence is rising due to improved imaging detection. They span a wide spectrum from indolent grade 1 tumors to aggressive grade 3 well-differentiated NETs and poorly differentiated neuroendocrine carcinomas (NEC).

PNETs are subdivided into functional and non-functional. Functional tumors include insulinoma, gastrinoma (Zollinger-Ellison), glucagonoma, VIPoma, and somatostatinoma, each producing characteristic clinical syndromes. Non-functional tumors (60-90%) present with mass effect, incidental imaging findings, or metastatic disease — often to the liver. Multiple endocrine neoplasia type 1 (MEN1), von Hippel-Lindau, neurofibromatosis 1, and tuberous sclerosis are recognized syndromic associations.

Treatment is multimodal: surgical resection for localized disease, somatostatin analogs (octreotide, lanreotide) for symptom control and antiproliferative effect, peptide receptor radionuclide therapy (PRRT, 177Lu-DOTATATE) for advanced well-differentiated tumors, targeted therapy (everolimus, sunitinib), and chemotherapy (capecitabine-temozolomide, platinum/etoposide for NEC). Liver-directed therapy is offered for hepatic metastases. Five-year survival ranges from 60-90% depending on grade and stage.

Symptoms

Insulinoma: hypoglycemic episodes, sweating, palpitations, neuroglycopenic symptoms
Gastrinoma: severe peptic ulcers, diarrhea, reflux (Zollinger-Ellison)
Glucagonoma: necrolytic migratory erythema, diabetes, weight loss
VIPoma: profuse watery diarrhea, hypokalemia, achlorhydria
Somatostatinoma: diabetes, cholelithiasis, steatorrhea
Non-functional: abdominal pain, mass effect, jaundice, weight loss
Carcinoid syndrome features in metastatic disease (flushing, diarrhea)
Asymptomatic incidental imaging finding

Risk Factors

Multiple endocrine neoplasia type 1 (MEN1)
Von Hippel-Lindau syndrome
Neurofibromatosis type 1
Tuberous sclerosis complex
Family history of neuroendocrine tumors
Age (peak diagnosis 40-60 years)
No clear environmental triggers identified
Slight male predominance

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Recurrent hypoglycemia with sympathetic features
  • Refractory peptic ulcer disease
  • Chronic watery diarrhea with hypokalemia
  • Necrolytic migratory rash with new diabetes
  • Abdominal pain with palpable mass or jaundice
  • Family history of MEN1 with new symptoms

Treatment Methods

01
Surgery: enucleation, distal pancreatectomy, Whipple, or debulking — based on location and stage
02
Somatostatin analogs: octreotide LAR or lanreotide for symptom and tumor control
03
Targeted therapy: everolimus (mTOR inhibitor), sunitinib (multikinase inhibitor)
04
Peptide receptor radionuclide therapy (PRRT, 177Lu-DOTATATE) in DOTATATE-positive tumors
05
Chemotherapy: capecitabine-temozolomide for grade 1-2 NETs; platinum/etoposide for high-grade NEC
06
Liver-directed therapy: TACE, radiofrequency ablation, hepatic resection
07
Genetic testing and family screening when MEN1 or VHL is suspected
08
Long-term follow-up: imaging, chromogranin A, hormone-specific markers

Which Department to Visit?

You can visit our Onkoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.