A tissue quality index: An intrinsic control for measurement of effects of preanalytical variables on FFPE tissue

Veronique M. Neumeister, Fabio Parisi, Allison M. England, Summar Siddiqui, Valsamo Anagnostou, Elizabeth Zarrella, Maria Vassilakopolou, Yalai Bai, Sasha Saylor, Anna Sapino, Yuval Kluger, David G. Hicks, Gianni Bussolati, Stephanie Kwei, David L. Rimm

Research output: Contribution to journalArticle

Abstract

While efforts are made to improve tissue quality and control preanalytical variables, pathologists are often confronted with the challenge of molecular analysis of patient samples of unknown quality. Here we describe a first attempt to construct a tissue quality index (TQI) or an intrinsic control that would allow a global assessment of protein status based on quantitative measurement of a small number of selected, informative epitopes. Quantitative immunofluorescence (QIF) of a number of proteins was performed on a series of 93 breast cancer cases where levels of expression were assessed as a function of delayed time to formalin fixation. A TQI was constructed based on the combination of proteins that most accurately reflect increased and decreased levels of expression in proportion to delay time. The TQI, defined by combinations of measurements of cytokeratin, ERK1/2 and pHSP-27 and their relationship to cold ischemic time were validated on a second build of the training series and on two independent breast tissue cohorts with recorded time to formalin fixation. We show an association of negative TQI values (an indicator for loss of tissue quality) with increasing cold ischemic time on both validation cohorts and an association with loss of ER expression levels on all three breast cohorts. Using expression levels of three epitopes, we can begin to assess the likelihood of delayed time to fixation or decreased tissue quality. This TQI represents a proof of concept for the use of epitope expression to provide a mechanism for monitoring tissue quality.

Original languageEnglish
Pages (from-to)467-474
Number of pages8
JournalLaboratory Investigation
Volume94
Issue number4
DOIs
Publication statusPublished - 2014

Keywords

  • epitope degradation
  • immunofluorescence
  • immunohistochemistry
  • preanalytic variables

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Cell Biology
  • Molecular Biology

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    Neumeister, V. M., Parisi, F., England, A. M., Siddiqui, S., Anagnostou, V., Zarrella, E., Vassilakopolou, M., Bai, Y., Saylor, S., Sapino, A., Kluger, Y., Hicks, D. G., Bussolati, G., Kwei, S., & Rimm, D. L. (2014). A tissue quality index: An intrinsic control for measurement of effects of preanalytical variables on FFPE tissue. Laboratory Investigation, 94(4), 467-474. https://doi.org/10.1038/labinvest.2014.7