title: A case of 'smouldering' mastocytosis with high mast cell burden, monoclonal myeloid cells, and C-KIT mutation Asp-816-Val.
abstract: Mastocytosis is a term used for a group of disorders characterized by abnormal growth and accumulation of tissue mast cells (MC) in one or more organ systems. In patients with systemic mastocytosis (SM) the clinical course may be indolent or aggressive or even complicated by leukemic progression or an associated clonal hematologic non mast cell lineage disease (AHNMD). However, at first presentation (diagnosis) it may be difficult to define the category of disease and the prognosis. We report on a 48-year-old female patient with SM with urticaria pigmentosa-like skin lesions and mediator-related symptoms. She was found to have splenomegaly, a high infiltration grade (MC) in bone marrow biopsies (>30%), mild anemia, and a high serum tryptase level (>500 ng/ml). In addition, she exhibited discrete histologic signs of myeloproliferation in the 'non-affected' marrow and monoclonal blood cells established by C-KIT 2468A-->T mutation (Asp-816-Val) -analysis and HUMARA assay. Despite these findings, however, the clinical course was stable over years and no AHNMD or organ impairment developed. Because of the 'intermediate' clinical signs and absence of progression to aggressive disease, we proposed the term 'smouldering mastocytosis'.
authors.affiliation: Department of Internal Medicine I, Division of Hematology and Hemostaseology, University of Vienna, Vienna, Austria.
authors.forename: J H
authors.initials: JH
authors.lastname: Jordan
authors.forename: R
authors.initials: R
authors.lastname: Fritsche-Polanz
authors.forename: W R
authors.initials: WR
authors.lastname: Sperr
authors.forename: G
authors.initials: G
authors.lastname: Mitterbauer
authors.forename: M
authors.initials: M
authors.lastname: Födinger
authors.forename: G H
authors.initials: GH
authors.lastname: Schernthaner
authors.forename: H
authors.initials: H
authors.lastname: Christian Bankl
authors.forename: W
authors.initials: W
authors.lastname: Gebhart
authors.forename: A
authors.initials: A
authors.lastname: Chott
authors.forename: K
authors.initials: K
authors.lastname: Lechner
authors.forename: P
authors.initials: P
authors.lastname: Valent
mesh_terms: D000328:Adult; D019943:Amino Acid Substitution; D000740:Anemia / Q000209:etiology; D001853:Bone Marrow / Q000473:pathology; D002452:Cell Count; D002999:Clone Cells / Q000737:chemistry / Q000473:pathology; D003062:Codon / Q000235:genetics; D004252:DNA Mutational Analysis; D018450:Disease Progression; D004303:Dosage Compensation, Genetic; D005260:Female; D006801:Humans; D007022:Hypotension / Q000209:etiology; D008407:Mast Cells / Q000473:pathology; D008415:Mastocytosis / Q000150:complications / Q000188:drug therapy / Q000235:genetics* / Q000473:pathology; D020125:Mutation, Missense; D022423:Myeloid Cells / Q000737:chemistry / Q000473:pathology; D019009:Proto-Oncogene Proteins c-kit / Q000235:genetics*; D011944:Receptors, Androgen / Q000032:analysis; D012697:Serine Endopeptidases / Q000097:blood; D012769:Shock / Q000209:etiology; D013575:Syncope / Q000209:etiology; D053802:Tryptases; D014582:Urticaria Pigmentosa / Q000150:complications / Q000188:drug therapy / Q000235:genetics / Q000473:pathology
chemical_list: D003062:Codon; D011944:Receptors, Androgen; D019009:Proto-Oncogene Proteins c-kit; D012697:Serine Endopeptidases; D053802:Tryptases