Neuroendocrine Tumors Management

Introduction to Neuroendocrine Tumors

Surgical resection is the primary and potentially curative treatment for localized neuroendocrine tumors, with the specific surgical approach determined by tumor size, location, functionality, and grade, as recommended by the National Comprehensive Cancer Network 1
Symptoms of neuroendocrine tumors vary based on tumor functionality, location, and hormone production, including hypoglycemia, confusion, sweating, palpitations, and symptoms related to insulin excess in insulinomas, according to the National Comprehensive Cancer Network 1
The National Comprehensive Cancer Network recommends that symptoms such as peptic ulcer disease, abdominal pain, diarrhea, and gastroesophageal reflux due to excessive gastrin production in gastrinomas should be managed with proton pump inhibitors 1

The National Comprehensive Cancer Network recommends controlling hormonal symptoms before surgical intervention, including stabilizing glucose with diet and/or diazoxide and using octreotide with caution in insulinomas 1
Preoperative vaccination with a trivalent vaccine is recommended for patients who might require splenectomy, as suggested by the National Comprehensive Cancer Network 1
The National Comprehensive Cancer Network suggests considering total parenteral nutrition for patients with severe weight loss due to glucagonoma 1

The National Comprehensive Cancer Network recommends that tumors <1 cm may be observed, especially if incidentally discovered, while tumors 1-2 cm require resection with lymph node dissection due to the risk of lymph node metastases 1
For tumors >2 cm or malignant-appearing, complete resection with negative margins and regional lymph node removal is recommended by the National Comprehensive Cancer Network 1
The surgical approach for neuroendocrine tumors varies by location, with pancreatoduodenectomy (Whipple procedure) recommended for tumors in the head of the pancreas and distal pancreatectomy with or without splenectomy for tumors in the body or tail, as suggested by the National Comprehensive Cancer Network 1

The National Comprehensive Cancer Network recommends surgical resection for all insulinomas, regardless of size, due to metabolic complications 1
For gastrinomas, the National Comprehensive Cancer Network suggests exploratory surgery with duodenotomy and intraoperative ultrasound for occult tumors, and duodenotomy with local resection/enucleation and periduodenal node dissection for duodenal tumors 1
The National Comprehensive Cancer Network recommends radical resection with regional lymphadenectomy for type 3 (sporadic) gastrinomas 2

The National Comprehensive Cancer Network recommends careful examination of the entire bowel for multiple synchronous lesions during surgical resection of bowel with regional lymphadenectomy 2
Consideration of prophylactic cholecystectomy is recommended if future treatment with somatostatin analogues is anticipated, as suggested by the National Comprehensive Cancer Network 2

The National Comprehensive Cancer Network recommends considering surgical excision of both primary tumor and liver metastases for limited hepatic metastases 1
Subtotal cytoreductive resection (>90% of tumor burden) can provide effective palliation for symptomatic recurrence, according to the National Comprehensive Cancer Network 1

The National Comprehensive Cancer Network recommends long-term follow-up after resection, as disease recurrence occurs in 21-42% of patients with pancreatic neuroendocrine tumors, sometimes after many years 1
Special considerations for surgical approach are necessary in patients with multiple endocrine neoplasia type 1 (MEN1 syndrome), who often have multiple tumors, as suggested by the National Comprehensive Cancer Network 1