Histiocytosis, also known as hand schuller christian disease, is related to histiocytosis-lymphadenopathy plus syndrome and erdheim-chester disease. An important gene associated with Histiocytosis is SLC29A3 (Solute Carrier Family 29 Member 3), and among its related pathways/superpathways are Innate Immune System and MIF Mediated Glucocorticoid Regulation. The drugs Prednisone and Mycophenolic acid have been mentioned in the context of this disorder. Affiliated tissues include lung and bone, and related phenotypes are Misorientated spindle and immune system