title: Oncocytic papillary carcinoma with lymphoid stroma (Warthin-like tumour) of the thyroid: a distinct entity with favourable prognosis.
abstract: OBJECTIVE
  We report the clinicopathological and immunohistochemical characteristics of 12 cases of a recently recognized entity, oncocytic papillary thyroid carcinoma (PC) with lymphoid stroma (Warthin-like tumour).
  
  
  RESULTS
  The cases were retrieved from the surgical pathology files of our departments. There were 11 female patients and one male patient; they ranged in age from 45 to 85 years (mean 64.2 years). The immunohistochemical profile demonstrated positivity of tumour cells for cytokeratins, thyroglobulin, Leu-M1 and anti-mitochondrial antigen. S100 protein-positive stromal dendritic/Langerhans cells were uniformly present. Polymerase chain reaction, in situ hybridization, and immunohistochemistry for Epstein-Barr virus (EBV) detection revealed no significant positive signal. MIB-1 labelling index was low, compatible with that of 'classical' PC.
  
  
  CONCLUSIONS
  Warthin-like tumour is a rare variant of PC, occurring predominantly in elderly women. Its histological features are distinct and well recognizable, differentiating this tumour from a more aggressive tall-cell variant of PC. The apparent indolent behaviour seems to be consistent with the presence of dendritic/Langerhans cells and with low proliferative activity. A possible role of EBV in pathogenesis of this lesion was not proven. Further studies are necessary to determine the prognosis and metastatic potential of this neoplasm.
authors.affiliation: Department of Pathology and Biology, Charles University Medical Faculty, Plzen, Czech Republic. ludvikova@fnplzen.cz
authors.forename: M
authors.initials: M
authors.lastname: Ludvíková
authors.forename: A
authors.initials: A
authors.lastname: Ryska
authors.forename: M
authors.initials: M
authors.lastname: Korabecná
authors.forename: M
authors.initials: M
authors.lastname: Rydlová
authors.forename: M
authors.initials: M
authors.lastname: Michal
mesh_terms: D000235:Adenolymphoma / Q000378:metabolism / Q000473:pathology*; D000368:Aged; D000369:Aged, 80 and over; D000911:Antibodies, Monoclonal / Q000032:analysis; D000951:Antigens, Neoplasm; D000954:Antigens, Surface / Q000032:analysis; D002291:Carcinoma, Papillary / Q000378:metabolism / Q000473:pathology*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D007633:Keratins / Q000032:analysis; D016256:Lewis X Antigen; D008297:Male; D008875:Middle Aged; D008928:Mitochondria / Q000276:immunology; D011379:Prognosis; D009418:S100 Proteins / Q000032:analysis; D013954:Thyroglobulin / Q000032:analysis; D013964:Thyroid Neoplasms / Q000378:metabolism / Q000473:pathology*
chemical_list: D000911:Antibodies, Monoclonal; D000951:Antigens, Neoplasm; D000954:Antigens, Surface; C407642:Leu-M1 antigen; D016256:Lewis X Antigen; D009418:S100 Proteins; D007633:Keratins; D013954:Thyroglobulin