Effects of Various Fixatives and Fixation Conditions on DNA Ploidy Analysis: A Need for Strict Internal DNA Standards (original) (raw)

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the Division of Pathology, City of Hope National Medical Center, Duarte, California.

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the Division of Pathology, City of Hope National Medical Center, Duarte, California.

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01 October 1990

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Jose M. Esteban, Khalil Sheibani, Margaret Owens, John Joyce, Ann Bailey, Hector Battifora, Effects of Various Fixatives and Fixation Conditions on DNA Ploidy Analysis: A Need for Strict Internal DNA Standards, American Journal of Clinical Pathology, Volume 95, Issue 4, 1 April 1991, Pages 460–466, https://doi.org/10.1093/ajcp/95.4.460
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Abstract

DNA ploidy and cell cycle analyses are being used with increasing frequency as additional, sometimes independent, biologic prognosticators of various malignancies. For obvious reasons, most of the large studies published are retrospective, using archival paraffin-embedded tissues likely to have been fixed and processed differently. To assess the effect of various fixation conditions on ploidy analyses, the authors performed a comprehensive study in which five contiguous aliquots from 26 tissue samples were fixed in formalin for 8, 24, and 48 hours; B5; and the ethanolbased fixative Omnifix® (Omni, Xenetics Biomed Inc., Irvine, CA), respectively. The samples were prepared and stained with the use of Hedley's method; the DNA analyses were done with a Coulter EPICS V® flow cytometer (Coulter Electronics, Hialeah, FL); and the resulting histograms were interpreted with Multicycle® software (Phoenix Flow Systems, San Diego, CA). Mean channels and coefficients of variation (CVs) of the Go/G] peaks were compared. Increasing fixation times in formalin produced slight shifting to the left on the G0/Gi peaks with differences up to 13 channels. Omni caused similar but more conspicuous changes, with maximal shifting of 51 channels. B5 created the opposite effect, with right-shifted G0/G, peaks up to 22 channels. The CVs deteriorated progressively with increasing fixation times in formalin. B5 and Omni fixatives conferred the worse histograms, with 6 and 15 cases, respectively, displaying CVs greater than 8. Such significant differences preclude the use of any other internal standard but adjacent normal tissue that was processed exactly the same as the tumor. The validity of DNA results obtained otherwise should be considered questionable. These findings may explain some of the previously published controversial reports and emphasize the need to use an internal standard and more stringent criteria to define aneuploidy in paraffin-embedded tissue.

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