title: Sialyl stage-specific embryonic antigen-1: a useful marker for differentiating the etiology of pleural effusion.
abstract: OBJECTIVE
  To assess the usefulness of sialyl stage-specific embryonic antigen-1 (SSEA-1) levels in differentiating the etiology of pleural effusion (PE).
  
  
  METHODS
  A solid-phase immunoradiometric sandwich assay with an FH6 monoclonal antibody was used to measure sialyl SSEA-1 levels in PEs of 132 patients with various diseases. Paired serum sialyl SSEA-1 levels were measured simultaneously in 47 patients with various subtypes of lung cancer
  
  
  RESULTS
  The pleural sialyl SSEA-1 levels were significantly higher in patients who had adenocarcinoma of the lung with positive cytology than in all the other patients, including those having malignancies other than adenocarcinoma of the lung, adenocarcinoma of the lung with cytology-negative PE, and benign diseases. There were no significant differences among sialyl SSEA-1 levels in the pleural fluid containing no adenocarcinoma cells. Using the cutoff value of 265 U/mL, the sensitivity was 64% (25/39) and the specificity was 95% (88/93) for the pleural sialyl SSEA-1 level to differentiate adenocarcinoma from other effusions.
  
  
  CONCLUSIONS
  With high specificity and modest sensitivity, the pleural sialyl SSEA-1 level is a useful biochemical marker for differentiating the etiology of PEs caused by adenocarcinoma from other diseases.
authors.affiliation: Chest Department, Veterans General Hospital-Taipei, Taiwan, ROC. leeyc@isc1.vghtpe.gov.tw
authors.forename: Y C
authors.initials: YC
authors.lastname: Lee
authors.forename: J H
authors.initials: JH
authors.lastname: Chern
authors.forename: S L
authors.initials: SL
authors.lastname: Lai
authors.forename: R P
authors.initials: RP
authors.lastname: Perng
mesh_terms: D000230:Adenocarcinoma / Q000097:blood / Q000150:complications; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D016256:Lewis X Antigen / Q000032:analysis* / Q000097:blood; D008175:Lung Neoplasms / Q000097:blood / Q000150:complications; D008297:Male; D008875:Middle Aged; D016066:Pleural Effusion, Malignant / Q000097:blood / Q000209:etiology / Q000276:immunology*; D012680:Sensitivity and Specificity
chemical_list: D016256:Lewis X Antigen