title: Expression of p57KIP2 in infantile hemangioma.
abstract: OBJECTIVE
  To compare the expression of p57 as indirect marker of genomic imprinting of CDKN1C in a series of infantile hemangiomas (IH) of patients with and without Beckwith-Wiedemann syndrome.
  
  
  METHODS
  Cases of mammary, salivary gland, liver (one each), and placental (2 cases) capillary hemangiomas all with histological features akin to IH as well as typical examples of cutaneous (8 cases) IH were analyzed by immunohistochemistry with antibody against p57(KIP2). This protein is the product of CDKN1C an imprinted, maternally expressed gene. The liver hemangioma and both chorioangiomas were from patients with Beckwith-Wiedemann syndrome. Positive and negative controls included normal placental tissue and complete hydatidiform mole, respectively. Positive staining was localized to nuclei.
  
  
  RESULTS
  Endothelial cells from the skin, breast and salivary gland hemangiomas were p57(KIP2) positive while chorioangiomas and liver IH presenting in patients with Beckwith-Wiedemann syndrome were negative. Controls reacted appropriately.
  
  
  CONCLUSIONS
  Endothelial cells of IH not associated with BWS normally express p57(KIP2) while chorioangiomas and IH of the liver associated with BWS do not. These results suggest that the BWS IH may result from dysregulation of the cell cycle.
authors.affiliation: Department of Pathology, Hospital de Niños 'Superiora Sor María Ludovica', 1900 La Plata, Argentina. patologi@netverk.com.ar
authors.forename: Ricardo
authors.initials: R
authors.lastname: Drut
authors.forename: Rosa Mónica
authors.initials: RM
authors.lastname: Drut
mesh_terms: D001506:Beckwith-Wiedemann Syndrome / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D015415:Biomarkers; D001943:Breast Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D002453:Cell Cycle / Q000502:physiology; D002648:Child; D002675:Child, Preschool; D050761:Cyclin-Dependent Kinase Inhibitor p57; D005260:Female; D006391:Hemangioma / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D006801:Humans; D007150:Immunohistochemistry; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D009687:Nuclear Proteins / Q000096:biosynthesis* / Q000235:genetics; D010922:Placenta Diseases / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D011247:Pregnancy; D012878:Skin Neoplasms / Q000235:genetics / Q000378:metabolism / Q000473:pathology; D016707:Tissue Fixation
chemical_list: D015415:Biomarkers; C493964:CDKN1C protein, human; D050761:Cyclin-Dependent Kinase Inhibitor p57; D009687:Nuclear Proteins