{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,30]],"date-time":"2026-10-30T03:10:09Z","timestamp":1793329809615,"version":"4.5.0"},"reference-count":129,"publisher":"American Society of Hematology","issue":"16","content-domain":{"domain":["ashpublications.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2020,4,16]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Hemophagocytic lymphohistiocytosis (HLH) is a syndrome describing patients with severe systemic hyperinflammation. Characteristic features include unremitting fever, cytopenias, hepatosplenomegaly, and elevation of typical HLH biomarkers. Patients can develop hepatitis, coagulopathy, liver failure, central nervous system involvement, multiorgan failure, and other manifestations. The syndrome has a high mortality rate. More and more, it is recognized that while HLH can be appropriately used as a broad summary diagnosis, many pediatric patients actually suffer from an expanding spectrum of genetic diseases that can be complicated by the syndrome of HLH. Classic genetic diseases in which HLH is a typical and common manifestation include pathogenic changes in familial HLH genes (PRF1, UNC13D, STXBP2, and STX11), several granule\/pigment abnormality genes (RAB27A, LYST, and AP3B1), X-linked lymphoproliferative disease genes (SH2D1A and XIAP), and others such as NLRC4, CDC42, and the Epstein-Barr virus susceptibility diseases. There are many other genetic diseases in which HLH is an infrequent complication of the disorder as opposed to a prominent manifestation of the disease caused directly by the genetic defect, including other primary immune deficiencies and inborn errors of metabolism. HLH can also occur in patients with underlying rheumatologic or autoinflammatory disorders and is usually designated macrophage activation syndrome in those settings. Additionally, HLH can develop in patients during infections or malignancies without a known (or as-yet-identified) genetic predisposition. This article will attempt to summarize current concepts in the pediatric HLH field as well as offer a practical diagnostic and treatment overview.<\/jats:p>","DOI":"10.1182\/blood.2019000936","type":"journal-article","created":{"date-parts":[[2020,2,27]],"date-time":"2020-02-27T18:19:55Z","timestamp":1582827595000},"page":"1332-1343","update-policy":"https:\/\/doi.org\/10.1182\/blood.2019cm0000","source":"Crossref","is-referenced-by-count":471,"title":["Pediatric hemophagocytic lymphohistiocytosis"],"prefix":"10.1182","volume":"135","author":[{"given":"Scott W.","family":"Canna","sequence":"first","affiliation":[{"name":"Division of Rheumatology, University of Pittsburgh, UPMC Children\u2019s Hospital of Pittsburgh, Pittsburgh, PA; and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rebecca A.","family":"Marsh","sequence":"first","affiliation":[{"name":"Division of Bone Marrow Transplantation and Immune Deficiency, University of Cincinnati, Cincinnati Children\u2019s 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