title: [Establishment of a specific serum proteomic profile model of nasopharyngeal carcinoma by MALDI-TOF MS].
abstract: OBJECTIVE
  To determine the specific serum peptide profile by comparing the serum differences between nasopharyngeal carcinoma patients (NPC) and normal control subjects, and to provide a diagnostic model of nasopharyngeal carcinoma.
  
  
  METHODS
  Pre-treatment serum samples of NPC and normal control subjects were collected and assayed by MALDI-TOF MS analysis. The peptides were extracted with magnetic beads coated with WCX. Mass spectrographic data were analyzed with ClinProt(TM) software. The specific serum peptide model of NPC was established by using genetic algorithms. The sensitivity and specificity of model were tested by blind testing.
  
  
  RESULTS
  The serum peptidome patterns of nasopharyngeal carcinoma was obtained. Differential expression of 99 peptide peaks was deteced, and the 808.99 Da, 834.61 Da, 3954.82 Da, 8141.88 Da peptide peaks showing statistically significant differences between the two groups, were used to establish the diagnostic model for nasopharyngeal cancer. The recognition rate and predictive power of the model were 90.0% and 84.3%, respectively. The sensitivity and specificity of the model were 80.0% and 64.0% determined by blind testing, respectively.
  
  
  CONCLUSIONS
  Significant differences of serum peptide peaks are detected between NPC and normal control groups. The established specific serum peptide model may have certain application in the diagnosis of nasopharyngeal carcinoma, and provides the basis for discovering specific tumor markers of nasopharyngeal carcinoma.
authors.affiliation: State Key Laboratory of Oncology in South China; Department of Radiation Oncology, Cancer Center, Sun Yat-sen University Guangzhou, Guangdong 510060, China.
authors.forename: Ya-lan
authors.initials: YL
authors.lastname: Tao
authors.forename: Zhi-gang
authors.initials: ZG
authors.lastname: Liu
authors.forename: Yun-fei
authors.initials: YF
authors.lastname: Xia
authors.forename: Wei
authors.initials: W
authors.lastname: Yi
mesh_terms: D000465:Algorithms; D014408:Biomarkers, Tumor / Q000097:blood*; D001798:Blood Proteins / Q000378:metabolism*; D006801:Humans; D009303:Nasopharyngeal Neoplasms / Q000097:blood* / Q000175:diagnosis*; D010449:Peptide Mapping / Q000379:methods*; D020543:Proteome / Q000378:metabolism; D040901:Proteomics / Q000379:methods; D012680:Sensitivity and Specificity; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D014408:Biomarkers, Tumor; D001798:Blood Proteins; D020543:Proteome