The influence of tissue ischemia time on RNA integrity and patient-derived xenografts (PDX) engraftment rate in a non-small cell lung cancer (NSCLC) Biobank

Francesco Guerrera, Fabrizio Tabbo, Luca Bessone, Francesca Maletta, Marcello Gaudiano, Elisabetta Ercole, Laura Annaratone, Maria Todaro, Monica Boita, Pier Luigi Filosso, Paolo Solidoro, Luisa Delsedime, Alberto Oliaro, Anna Sapino, Enrico Ruffini, Giorgio Inghirami

Research output: Contribution to journalArticlepeer-review

Abstract

Introduction Bio-repositories are invaluable resources to implement translational cancer research and clinical programs. They represent one of the most powerful tools for biomolecular studies of clinically annotated cohorts, but high quality samples are required to generate reliable molecular readouts and functional studies. The objective of our study was to define the impact of cancer tissue ischemia time on RNA and DNA quality, and for the generation of Patient-Derived Xenografts (PDXs). Methods One-hundred thirty-five lung cancer specimens were selected among our Institutional Bio-Bank samples. Associations between different warm (surgical) and cold (ex-vivo) ischemia time ranges and RNA quality or PDXs engraftment rates were assessed. RNA quality was determined by RNA integrity number (RINs) values. Fresh viable tissue fragments were implanted subcutaneously in NSG mice and serially transplanted. Results RNAs with a RIN7 were detected in 51% of the sample (70/135), with values of RIN significantly lower (OR 0.08, P = 0.01) in samples preserved for more than 3 hours before cryopreservation. Higher quality DNA samples had a concomitant high RIN. Sixty-three primary tumors (41 adenocarcinoma) were implanted with an overall engraftment rate of 33%. Both prolonged warm (2 hours) and ex-vivo ischemia time (10 hours) were associated to a lower engraftment rate (OR 0.09 P = 0.01 and OR 0.04 P = 0.008, respectively). Conclusion RNA quality and PDXs engraftment rate were adversely affected by prolonged ischemia times. Proper tissue collection and processing reduce failure rate. Overall, NSCLC Bio-Banking represents an innovative modality, which can be successfully executed in routine clinical settings, when stringent Standard Operating Procedures are adopted.

Original languageEnglish
Article numberA277
JournalPLoS One
Volume11
Issue number1
DOIs
Publication statusPublished - Jan 5 2016

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Medicine(all)

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