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Proton pump inhibitor (PPI)-associated gastric neuroendocrine tumors (gNETs) present a classification challenge. This case suggests a new type Ib classification for PPI-associated gNETs to guide treatment decisions.

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Area of Science:

  • Gastroenterology
  • Endocrinology
  • Oncology

Background:

  • Recent S2k guidelines classify gastric neuroendocrine tumors (gNETs) into 4 types based on etiology, prognosis, and malignant potential, influencing treatment.
  • Proton pump inhibitors (PPIs) are widely used for gastroesophageal reflux disease and may be associated with gNET development.
  • The current classification system may not adequately address the unique characteristics of PPI-associated gNETs.

Purpose of the Study:

  • To report a case of a 55-year-old patient with an incidentally discovered 15mm gNET.
  • To discuss the diagnostic and therapeutic challenges posed by PPI-associated gNETs.
  • To propose a revised classification for PPI-associated gNETs.

Main Methods:

  • Case report of a patient with a history of 20-year PPI use.
  • Endoscopic submucosal dissection (ESD) for gNET resection.
  • Histopathological analysis of resected tumor.
  • Clinical follow-up after PPI cessation.

Main Results:

  • A 15mm gNET was incidentally found in a patient with long-term PPI use.
  • Histology revealed an R1 resection status.
  • Following PPI cessation, no tumor recurrence was observed.
  • Significant regression of associated gastric polyps was noted after stopping PPIs.

Conclusions:

  • The case highlights a potential gap in the current gNET classification regarding PPI association.
  • PPI-associated gNETs may warrant specific consideration due to their unique pathophysiology (gastrin hypersecretion).
  • A proposed 'type Ib' classification for PPI-associated gNETs could resolve therapeutic dilemmas and guide management.