Histiocytosis-Lymphadenopathy Plus Syndrome, also known as h syndrome, is related to hemoglobin h disease and igg4-related disease, and has symptoms including fever An important gene associated with Histiocytosis-Lymphadenopathy Plus Syndrome is SLC29A3 (Solute Carrier Family 29 Member 3), and among its related pathways/superpathways are Nuclear events mediated by NFE2L2 and Circadian Clock. The drugs Prednisone and Mycophenolic acid have been mentioned in the context of this disorder. Affiliated tissues include heart and skin, and related phenotypes are delayed puberty and fever