Hypersensitivity Reaction Type Iv Disease, also known as immunoproliferative disorders, is related to cryoglobulinemia and autoimmune lymphoproliferative syndrome. An important gene associated with Hypersensitivity Reaction Type Iv Disease is ACE (Angiotensin I Converting Enzyme), and among its related pathways/superpathways are Innate Immune System and MIF Mediated Glucocorticoid Regulation. The drugs Gemcitabine and Rituximab have been mentioned in the context of this disorder. Affiliated tissues include t cells and small intestine, and related phenotypes are homeostasis/metabolism and immune system