Which combination of tumors is most characteristic of MEN1?

• A. Gastrinoma with parathyroid tumors and pituitary tumors
• B. Gastrinoma with lipomas
• C. Gastrinoma with pancreatic adenocarcinoma
• D. Gastrinoma with thyroid carcinoma

Answer: (A)

MEN1 is defined by a cluster of tumors in endocrine glands, most classically the triad of parathyroid adenomas causing hyperparathyroidism, pancreatic neuroendocrine tumors (often gastrinomas), and pituitary adenomas. Seeing gastrinoma together with parathyroid tumors and pituitary tumors fits this characteristic pattern precisely, and it’s why this combination is the hallmark of MEN1. Other pairings—gastrinoma with lipomas, pancreatic adenocarcinoma, or thyroid carcinoma—do not reflect the typical MEN1 tumor set (lipomas can occur but are not the defining group, and pancreatic adenocarcinoma or thyroid carcinoma are not characteristic MEN1 manifestations).