Multiple Endocrine Neoplasia, Type Iv, also known as multiple endocrine neoplasia type 4, is related to neuroendocrine tumor and pituitary adenoma 4, acth-secreting. An important gene associated with Multiple Endocrine Neoplasia, Type Iv is CDKN1B (Cyclin Dependent Kinase Inhibitor 1B), and among its related pathways/superpathways are Signal Transduction and Transcription_CREM signaling in testis. Affiliated tissues include pituitary and thyroid, and related phenotypes are hyperparathyroidism and hypercalcemia