title: [Surfactant proteins-A and D as important serum markers for interstitial lung disease in patients with polymyositis or dermatomyositis].
abstract: OBJECTIVE
  To explore the possible diagnostic values of serum surfactant protein-A (SP-A) and surfactant protein-D (SP-D) for interstitial lung diseases (ILD) in patients with polymyositis or dermatomyositis (PM/DM).
  
  
  METHODS
  Serum MCP-1 concentrations were measured by enzyme-linked immunosorbent assay (ELISA) in 100 adult PM/DM patients, 20 patients with pulmonary infection and 42 healthy controls. And the association with their clinical features and serum levels of SP-A and SP-D was analyzed.
  
  
  RESULTS
  The serum levels of SP-A and SP-D in the PM/DM patients with ILD were both significantly higher than those without ILD and healthy controls (all P < 0.01) while there were no significance differences with those with infectious lung diseases (P > 0.05). The sensitivity of serum abnormal levels of SP-A, SP-D and combination of SP-A and SP-D for ILD in PM/DM patients were 66.1%, 64.3% and 80.0% and the specificity 72.7%, 72.7% and 70.2% respectively. The serum levels of SP-A were positively correlated with serum ferritin and C-reactive protein (CRP) and negatively with percent carbon monoxide diffusing capacity (DLCO%) (r = -0.474, P < 0.05), VC% (r = -0.404, P < 0.05) while the serum levels of SP-D were negatively correlated with circulating CD3+T cells (r = -0.244, P < 0.05) and CD4+T cells (r = -0.277, P < 0.05) in PM/DM patients. Furthermore, SP-A was an independent risk factor for death of ILD in PM/DM (OR 1.032, 95%CI 1.006 - 1.059, P < 0.05).
  
  
  CONCLUSIONS
  SP-A and SP-D may be potential useful serum markers for the diagnosis of ILD in PM/DM patients. And the combined detection of SP-A and SP-D offers a higher sensitivity than either marker alone. As a risk factor, serum SP-A can predict the prognosis of PM/DM patients with ILD.
authors.affiliation: Graduate School, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100730, China.
authors.forename: Fang
authors.initials: F
authors.lastname: Chen
authors.forename: Xiao-ming
authors.initials: XM
authors.lastname: Shu
authors.forename: Dong-xue
authors.initials: DX
authors.lastname: Wang
authors.forename: Yao
authors.initials: Y
authors.lastname: Xie
authors.forename: Guo-chun
authors.initials: GC
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D003882:Dermatomyositis / Q000097:blood* / Q000150:complications; D005260:Female; D006801:Humans; D017563:Lung Diseases, Interstitial / Q000097:blood* / Q000150:complications; D008297:Male; D008875:Middle Aged; D017285:Polymyositis / Q000097:blood* / Q000150:complications; D037662:Pulmonary Surfactant-Associated Protein A / Q000097:blood*; D037663:Pulmonary Surfactant-Associated Protein D / Q000097:blood*; D055815:Young Adult
chemical_list: D037662:Pulmonary Surfactant-Associated Protein A; D037663:Pulmonary Surfactant-Associated Protein D