Evaluation of the HPV typing INNO-LiPA EXTRA assay on formalin-fixed paraffin-embedded cervical biopsy samples.

J Clin Virol

Unit of Surgical Pathology and Centre for Molecular and Translational Oncology (COMT), University of Parma, Parma, Italy. Electronic address:

Published: December 2014

AI Article Synopsis

  • The INNO-LiPA EXTRA assay detects a broader range of HPV types than its predecessor and was tested on cervical scrapings and FFPE biopsy specimens.
  • A study involving 188 women showed 100% agreement on HPV status and 72.9% agreement on the number of different HPV types present.
  • The EXTRA assay demonstrated excellent performance in typing high-risk HPVs, with results comparable to the earlier version despite its greater complexity and coverage.

Article Abstract

Background: The HPV genotyping line probe assay INNO-LiPA EXTRA allows the detection of a wider spectrum of viral types compared to the earlier V2 version of the assay. Its performance in formalin-fixed paraffin-embedded tissues is unknown.

Objectives: To test the EXTRA assay in HPV genotyping of paired cervical scrapings and corresponding FFPE biopsy specimens.

Study Design: Paired samples from 188 women with abnormal cytology were examined using the INNO-LiPA HPV genotyping assay, version EXTRA. The assay can simultaneously detect 18 high-risk, 7 low-risk, and 2 unclassified HPV types. Kappa statistics were used to measure interrater agreement between groups.

Results: The evaluation of paired cervical scraping and biopsy samples gave a 100% overall agreement for HPV status and of 72.9% (kappa 0.6554) for the number of infecting HPVs. 392 out of 507 individual HPV types were concordant, corresponding to a positive agreement rate of 87.2% (95% CI 84.1-90.3). As to the individual genotypes, the agreement was absolute for HPV 45, 68, 73 (kappa 1), excellent for HPV 6, 11, 16, 18, 31, 35, 39, 44, 51, 52, 53, 54, 56, 69/71 and 82 (kappa 0.7796-0.9714), good for HPV26, 33, 43, 58, 66 and 74 (kappa 0.6768-0.7449), and poor for HPV 59 and 40. These agreement values were comparable to those obtained with the V2 assay.

Conclusions: The EXTRA assay provided excellent performance in HPV typing on FFPE samples comparable to the earlier version of the test despite higher complexity and increased coverage of types.

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Source
http://dx.doi.org/10.1016/j.jcv.2014.10.016DOI Listing

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