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Multiple endocrine neoplasia
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Condition

Multiple endocrine neoplasia

Multiple endocrine neoplasia is a group of disorders characterized by tumors in multiple hormone-producing glands of the endocrine system.

Overview

This group of disorders involves tumors (neoplasia) in at least two endocrine glands, though they can also develop in other organs. These tumors may be noncancerous (benign) or cancerous (malignant). The major forms are types 1, 2, and 4, distinguished by the genes involved and the specific glands affected.

Types and Symptoms

  • Type 1: Frequently involves tumors of the parathyroid glands, pancreas, and pituitary gland. The most common sign is hyperparathyroidism, which disrupts calcium balance and can lead to kidney stones, bone thinning, and hypertension.
  • Type 2: Characterized by medullary thyroid carcinoma. Some individuals also develop a pheochromocytoma, an adrenal tumor that can cause dangerously high blood pressure. Subtypes include 2A, 2B, and familial medullary thyroid carcinoma (FMTC).
  • Type 4: Features symptoms similar to type 1, including hyperparathyroidism and tumors of the pituitary gland and other endocrine organs.

Causes

The condition is caused by mutations in specific tumor suppressor genes:

  • MEN1 gene: Mutations lead to a loss of the protein menin, which normally regulates cell growth.
  • RET gene: Mutations overactivate the RET protein, triggering unchecked cell growth and division.
  • CDKN1B gene: Mutations reduce the amount of the protein p27, which normally helps control cell division.

Inheritance

These conditions are generally inherited in an autosomal dominant pattern. In type 1, while one mutated gene is inherited, tumor formation usually requires a second mutation to occur in specific cells during a person's lifetime. In types 2 and 4, one mutated copy is typically sufficient to cause the disorder.

Frequently Asked Questions

While genetics drive tumor formation, certain habits may lessen complications: maintain adequate calcium and vitamin D intake to support bone health; avoid smoking and excess alcohol, which can aggravate endocrine tumors; keep a healthy weight to reduce insulin resistance that may stimulate pancreatic neuroendocrine growth; and follow a low‑sodium diet if you have hypertension from pheochromocytoma or hyperparathyroidism.
Schedule pre‑conception counseling with a medical geneticist. You can pursue targeted genetic testing for the specific MEN mutation (MEN1, RET, or CDKN1B) in yourself and, if positive, consider prenatal testing (chorionic villus sampling or amniocentesis) or pre‑implantation genetic diagnosis (PGD) with IVF to avoid transmitting the mutation. Discuss the timing of surveillance imaging during pregnancy, as some modalities (e.g., MRI without gadolinium) are safer than others.
Guidelines recommend starting biochemical screening (serum calcium, PTH, fasting gastrin, prolactin) by age 8–10 and repeating every 1–2 years. Imaging (MRI of pituitary, abdominal CT/MRI for pancreatic lesions, and neck ultrasound for parathyroid disease) is usually done every 2–3 years or sooner if labs become abnormal.
Sudden, severe headaches, pounding heartbeats, profuse sweating, palpitations, and a rapid rise in blood pressure (often >180/110 mmHg) are red‑flag symptoms. If any of these appear, seek emergency evaluation because an untreated pheochromocytoma can trigger hypertensive crisis, stroke, or cardiac arrhythmia.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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