{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T23:48:23Z","timestamp":1788306503064,"version":"build-2803163510"},"reference-count":21,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2007,9,14]],"date-time":"2007-09-14T00:00:00Z","timestamp":1189728000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["American J Hematol"],"published-print":{"date-parts":[[2008,2]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Langerhans cell histiocytosis (LCH) and related entities are neoplasms of unknown pathogenesis. Here, we describe studies assessing the role of <jats:italic>NOTCH1<\/jats:italic> mutations in LCH, which were based on a case of fatal Langerhans cell tumor after T\u2010cell acute lymphoblastic leukemia (T\u2010ALL). Although the two types of neoplasm in this patient were temporally and pathologically distinct, molecular analyses showed that they harbored the same T\u2010cell receptor gene rearrangements and two activating <jats:italic>NOTCH1<\/jats:italic> mutations involving exons 27 and 34. The exon 27 mutation altered a conserved cysteine residue in the N\u2010terminal portion of the NOTCH1 heterodimerization domain, while the mutation in exon 34 introduced a premature stop codon that results in the deletion of C\u2010terminal negative regulatory PEST domain. Analysis of cDNA prepared from the aggressive Langerhans cell tumor showed that the <jats:italic>NOTCH1<\/jats:italic> mutations were aligned in cis, a configuration that caused synergistic increases in NOTCH1 signal strength in reporter gene assays. Immunohistochemistry confirmed that the Langerhans cell tumor also expressed NOTCH1 protein. Although these data suggested that <jats:italic>NOTCH1<\/jats:italic> mutations might contribute to the pathogenesis of typical sporadic LCH and related neoplasms occurring in the absence of T\u2010ALL, an analysis of 24 cases of LCH and Rosai\u2013Dorfman Disease occurring in patients without an antecedent history of T\u2010ALL revealed no mutations. Thus, activating <jats:italic>NOTCH1<\/jats:italic> mutations appear to be unique to aggressive Langerhans cell tumors occurring after T\u2010ALL. Persistent expression of NOTCH1 in such tumors suggests that Notch pathway inhibitors could have a role in the treatment of these unusual neoplasms. Am. J. Hematol., 2008. \u00a9 2007 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/ajh.21044","type":"journal-article","created":{"date-parts":[[2007,9,14]],"date-time":"2007-09-14T16:16:56Z","timestamp":1189786616000},"page":"116-121","source":"Crossref","is-referenced-by-count":58,"title":["Aggressive Langerhans cell histiocytosis following T\u2010ALL: Clonally related neoplasms with persistent expression of constitutively active NOTCH1"],"prefix":"10.1002","volume":"83","author":[{"given":"Scott J.","family":"Rodig","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ethan G.","family":"Payne","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Barbara A.","family":"Degar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Barrett","family":"Rollins","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrew L.","family":"Feldman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elaine S.","family":"Jaffe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arlene","family":"Androkites","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lewis B.","family":"Silverman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Janina A.","family":"Longtine","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jeffery L.","family":"Kutok","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark D.","family":"Fleming","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jon C.","family":"Aster","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2007,9,14]]},"reference":[{"key":"e_1_2_1_2_2","volume-title":"Pathology and Genetics of Tumours of Haematopoietic and Lymphoid Tissues. 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