title: Retrospective determination of HIV-1 status by a PCR method on paraffin wax embedded sections.
abstract: OBJECTIVE
  To develop a simple but reliable polymerase chain reaction (PCR) method to determine the HIV-1 status of patients on formalin fixed, paraffin wax embedded lymph node tissue.
  
  
  METHODS
  Fifty lymph node specimens, 20 from HIV-1 seropositive and 30 from HIV-1 seronegative patients, were analysed. Lymph nodes with a variety of disease conditions were included in the study. Tissue sections were treated with a DNA extraction buffer containing proteinase K and the crude cell lysate was used in PCR analysis. Nested primers were used to amplify HIV-1 DNA sequences coding for gag, pol and env proteins. PCR products were demonstrated by polyacrylamide gel electrophoresis. Results were then compared with HIV-1 serology of the patients from whom the tissue was obtained.
  
  
  RESULTS
  The PCR method yielded a specificity of 100%, a sensitivity of 95%, a positive predictive value of 100%, and a negative predictive value of 97% when compared with HIV-1 serology. The kappa statistic (0.958) showed an excellent agreement between the PCR method and serology. Furthermore, HIV-1 DNA was demonstrated in lymph node tissue from a serologically unconfirmed acquired immunodeficiency syndrome case necropsied in 1982.
  
  
  CONCLUSIONS
  This PCR method is a simple and reliable means of retrospectively determining the HIV-1 status of patients using formalin fixed, paraffin wax embedded lymph node tissue.
authors.affiliation: Department of Anatomical Pathology, Faculty of Medicine, University of Pretoria, South Africa.
authors.forename: T
authors.initials: T
authors.lastname: Slavik
authors.forename: M
authors.initials: M
authors.lastname: Wolfaardt
authors.forename: H
authors.initials: H
authors.lastname: van Zyl
authors.forename: I W
authors.initials: IW
authors.lastname: Simson
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000821:virology; D006679:HIV Seropositivity / Q000821:virology; D015497:HIV-1 / Q000302:isolation & purification*; D006801:Humans; D008198:Lymph Nodes / Q000821:virology; D016133:Polymerase Chain Reaction / Q000379:methods*; D011237:Predictive Value of Tests; D012189:Retrospective Studies; D012680:Sensitivity and Specificity