title: [Calibration of false positive result in detection of BCR/ABL using fluorescence in situ hybridization].
abstract: OBJECTIVE
  To explore the effect of false positive signals during detection of BCR/ABL fusion gene by fluorescence in situ hybridization (FISH), and develop a method for calibration.
  
  
  METHODS
  Normal specimens were mixed with BCR/ABL positive specimens in which presented signal pattern of 1-red-2-green-1-fusion (1R2G1F) using dual color dual fusion (DCDF) probes and 1-red-1-green-1-fusion (1R1G1F) using extra signal (ES) probes in different proportions. Mixed samples were detected using DCDF and ES probes. Results of DCDF probes, ES probe before calibration, ES probes after calibration and theoretical results were compared by binomial distribution in different proportions.
  
  
  RESULTS
  The rate of false positive signals has risen with increase of negative rate. A significant difference was found between theoretical proportion and results without calibration in negative level, 5%, 10% and 25% positive level (P<0.05). There was no significant difference between theoretical proportion and results without calibration in 50% and 90% positive level (P>0.05). Also there was no significant difference between theoretical proportion and calibrated results (P>0.05).
  
  
  CONCLUSIONS
  Calibration of FISH result can delimitate the effect of false positives, and can provide more reliable results in cases with low level positive rates.
authors.affiliation: Department of Hematology, Guangzhou First People's Hospital, Guangzhou Medical University, Guangzhou, Guangdong 510180, China. qingshanli@hotmail.com.
authors.forename: Qinghua
authors.initials: Q
authors.lastname: Du
authors.forename: Qingshan
authors.initials: Q
authors.lastname: Li
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Chen
authors.forename: Yi
authors.initials: Y
authors.lastname: Ying
authors.forename: Shunqing
authors.initials: S
authors.lastname: Wang
mesh_terms: D000328:Adult; D002138:Calibration; D005189:False Positive Reactions; D005260:Female; D016044:Fusion Proteins, bcr-abl / Q000235:genetics*; D006801:Humans; D017404:In Situ Hybridization, Fluorescence / Q000379:methods / Q000592:standards*; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000175:diagnosis* / Q000235:genetics*; D055815:Young Adult
chemical_list: D016044:Fusion Proteins, bcr-abl