Multiple Endocrine Neoplasia, Type I, also known as multiple endocrine neoplasia type 1, is related to gastric neuroendocrine neoplasm and insulinoma, and has symptoms including diarrhea An important gene associated with Multiple Endocrine Neoplasia, Type I is MEN1 (Menin 1), and among its related pathways/superpathways are ERK Signaling and Prolactin Signaling. The drugs Dexlansoprazole and Lansoprazole have been mentioned in the context of this disorder. Affiliated tissues include pituitary and pancreas, and related phenotypes are hypercalcemia and primary hyperparathyroidism