title: Five serum proteins identified using SELDI-TOF-MS as potential biomarkers of gastric cancer.
abstract: OBJECTIVE
  The aims of this study were to detect serum proteomic patterns in gastric cancer serum samples using Surface-enhanced Laser Desorption/ionization-Time-of-flight-Mass Spectrometry ProteinChip array technology, to screen biomarker candidates, to build diagnostic models and to evaluate their clinical significance.
  
  
  METHODS
  Serum samples from patients with gastric cancer and normal healthy control subjects (n = 125) were analysed using surface-enhanced laser desorption/ionization technology. The spectra were generated on weak cation exchange (WCX2) chips, and protein peak clustering and classification analyses were established using Ciphergen Biomarker Wizard and Biomarker Pattern software, respectively. The diagnostic models were developed and validated by discriminant analysis. In addition, the results of the surface-enhanced laser desorption/ionization model were compared with the biomarkers carcinoembryonic antigen and carbohydrate antigen 199 in a subset of samples using a microparticle enzyme immunoassay.
  
  
  RESULTS
  Five protein peaks at 2046, 3179, 1817, 1725 and 1929 m/z were automatically chosen as components of the best biomarker pattern for diagnosis of gastric cancer. In addition, we identified a single protein peak at 4665 m/z, which could distinguish between stage I/II and stage III/IV gastric cancer with a specificity and sensitivity of 91.6% (11/12) and 95.4% (21/22), respectively. When this biomarker was validated in the second set of samples, the specificity and sensitivity were 91.7% (11/12) and 86.3% (19/22), respectively.
  
  
  CONCLUSIONS
  The present results suggest that serum surface-enhanced laser desorption/ionization protein profiling can distinguish patients with gastric cancer, and in particular stage I/II patients, from normal subjects with a relatively high sensitivity and specificity. Surface-enhanced Laser Desorption/ionization-Time-of-flight-Mass Spectrometry is a potential new diagnostic tool for the screening of gastric cancer.
authors.affiliation: Department of Oncology, The Affiliated Tumor Hospital of Harbin Medical University, Harbin, China. lu_haibo200@126.com
authors.forename: Hai-bo
authors.initials: HB
authors.lastname: Lu
authors.forename: Jian-hua
authors.initials: JH
authors.lastname: Zhou
authors.forename: Yu-yan
authors.initials: YY
authors.lastname: Ma
authors.forename: Hai-ling
authors.initials: HL
authors.lastname: Lu
authors.forename: Ya-li
authors.initials: YL
authors.lastname: Tang
authors.forename: Qing-Yuan
authors.initials: QY
authors.lastname: Zhang
authors.forename: Chang-hong
authors.initials: CH
authors.lastname: Zhao
mesh_terms: D000328:Adult; D000368:Aged; D000465:Algorithms; D014408:Biomarkers, Tumor / Q000097:blood*; D001798:Blood Proteins / Q000032:analysis*; D016000:Cluster Analysis; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D040081:Protein Array Analysis; D012680:Sensitivity and Specificity; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013274:Stomach Neoplasms / Q000097:blood* / Q000145:classification* / Q000473:pathology
chemical_list: D014408:Biomarkers, Tumor; D001798:Blood Proteins