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Coping with formalin banning in pathology: under vacuum long-term tissue storage with no added formalin

  • Luca MastracciEmail author
  • Alessandro Gambella
  • Alberto Bragoni
  • Simona Pigozzi
  • Lorenza Pastorino
  • Irene Vanni
  • Ilaria Tosi
  • Michela Campora
  • Roberto Fiocca
  • Federica Grillo
Original Paper
  • 72 Downloads

Abstract

Formalin is toxic and has recently been classified as carcinogenic leading to a proposed European formalin ban. But, the pathology use of formalin has however been completely overlooked, and this is proving to be a relevant issue, as no alternative, reliable, tissue fixative is available. Various systems have been proposed to reduce formalin use and exposure; long-term storage and disposal of formalin is also a problem. With this in mind, under vacuum sealing (UVS) systems have been proposed for transportation/storage, however, for how long tissue retains its characteristics (morphological and molecular) is unknown. This study aims to compare histology specimens stored by formalin immersion (FI) and specimens stored after fixation with UVS technique with no additional formalin, at different time periods. Twenty tissue samples (10FI; 10UVS) were stored for different time periods (15 days, 1–2–3–6–12 months) for a total of 120 samples, compared with regard to their morphology, histochemistry, immunoreactivity (24 specific antibodies) and DNA status. All samples showed well-preserved morphology and overlapping staining quality. A significant reduction in immunoreactivity was however identified in the various time periods, particularly for heat pre-treated nuclear antigens, and this commenced earlier (1 month) for FI. UVS storage showed higher DNA content than FI but slightly poorer DNA integrity. These results add important knowledge to the use of UVS in daily practice, as long-term storage of pre-fixed tissue in UVS is not detrimental to the quality of tissue while having the boon of using very little formalin with less operator exposure and lower disposal costs.

Keywords

Formalin ban Vacuum storage Safety Pathology 

Notes

Acknowledgements

We wish to thank all of the technical staff at the Anatomic Pathology laboratory, IRCCS Policlinico San Martino, Genoa, Italy and Mrs Sonia Massa for her contribution to the Quality Assurance Program.

Compliance with ethical standards

Conflict of interest

No conflict to disclose.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Anatomic Pathology, Department of Surgical Sciences and Integrated Diagnostics (DISC)University of GenoaGenoaItaly
  2. 2.IRCCS Ospedale Policlinico San MartinoGenoaItaly
  3. 3.Genetics of Rare Tumors Laboratory, Department of Internal Medicine and Medical Specialties (DiMI)University of GenoaGenoaItaly

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