Exocrine Pancreatic Insufficiency, Dyserythropoietic Anemia, and Calvarial Hyperostosis, is also known as pancreatic insufficiency-anemia-hyperostosis syndrome. An important gene associated with Exocrine Pancreatic Insufficiency, Dyserythropoietic Anemia, and Calvarial Hyperostosis is COX4I2 (Cytochrome C Oxidase Subunit 4I2). Affiliated tissues include pancreas and skin, and related phenotypes are failure to thrive and anemia of inadequate production