title: [Clinicopathological analysis of 23 cases of NK/T-cell lymphoma of nasal type].
abstract: OBJECTIVE
  To improve the understanding of nasal NK/T-cell lymphoma by analyzing its phenotypic and clinicopathological features.
  
  
  METHODS
  Twenty-three cases of nasal NK/T-cell lymphoma diagnosed between 2003 and 2007 in the department of pathology of Guilin Medical College were included in the study. The expression level of TIA-1, CD56, CD3, CD20, CK and EBV markers was determined by immunohistochemistry. The results were correlated with clinicopathological features.
  
  
  RESULTS
  69.9% (16/23) of the nasal NK/T-cell lymphoma occurred in the nasal cavity. All the 23 cases displayed necrosis, ulceration and nose bleeding. 39.1% (9/23) showed angiodestructive growth pattern. 21.74% (5/23) were accompanied by squamous cell carcinoma-like epitheliomatous hyperplasia. All the cases were positive for TIA-1 and CD3. 95.7% (22/23) of the cases were positive for CD56, while 21.7% (5/23) were weakly positive for EBV. None of the cases was positive for either CD20 or CK.
  
  
  CONCLUSIONS
  Nasal NK/T-cell lymphoma is characterized by multiple clinicopathological features. Attention is needed to differentiate the tumor from inflammatory lesions and low grade squamous cell carcinoma. Understanding of various morphological and phenotypic features (i.e. expression of TIA-1, CD56 and CD3, and lack of CD20 and CK) is the key for the diagnosis of nasal NK/T-cell lymphoma.
authors.affiliation: Department of Pathology, Guilin Medical College, Guilin, 541001, China.
authors.forename: Mingshen
authors.initials: M
authors.lastname: Lu
authors.forename: Fancai
authors.initials: F
authors.lastname: Li
authors.forename: Qiaoyan
authors.initials: Q
authors.lastname: Hou
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D006801:Humans; D054391:Lymphoma, Extranodal NK-T-Cell / Q000473:pathology*; D008875:Middle Aged; D009669:Nose Neoplasms / Q000473:pathology*; D055815:Young Adult