{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T03:30:10Z","timestamp":1790220610663,"version":"4.1.0"},"reference-count":26,"publisher":"BMJ","issue":"3","content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["J Clin Pathol"],"accepted":{"date-parts":[[2020,5,28]]},"published-print":{"date-parts":[[2021,3]]},"abstract":"<jats:sec>\n                    <jats:title>Aims<\/jats:title>\n                    <jats:p>Though formalin remains to be the gold standard fixative in pathology departments, analytical challenges persist for nucleic acid evaluations. In our laboratory, formalin fixation of skin samples in particular impairs diagnostic accuracy and demands repetition of biopsies and analytical procedures. PAXgene Tissue Systems may be an alternative; however, according to manufacturer specifications it only allows fixation for 48\u2009hours before having to add a stabiliser. This may be a challenge in laboratories, which are closed in weekends and bank holidays. Our aim was to validate this alternative fixative for dermatological samples with prolonged fixation times using standard laboratory protocols developed for formalin-fixed specimens. We compared the results with gold standard formalin fixation.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Skin specimens were formalin or PAXgene fixed for either 2\u2009hours, 24\u2009hours, 3 days or 7 days, paraffin-embedded, analysed and scored by observers.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Generally, formalin outperformed PAXgene fixation in H&amp;E stains and fluorescence in situ hybridisation (FISH), but both seem usable for diagnostics. Time of PAXgene fixation did not have an impact on alcian blue-Van Gieson (ABVG), H&amp;E (p=0.48), nor immunohistochemistry (p=0.74). There was a tendency towards best PAXgene performance at 24\u2009hours of fixation for FISH, and for DNA integrity analysis 24 hours or 3 days.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Prolonging PAXgene fixation time to 3 days before adding stabiliser does not seem to have major impact on performance of general diagnostic analysis, but our preliminary results show optimisation of internal protocols are needed. PAXgene is an expensive alternative and may be confined to some dermatological samples.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1136\/jclinpath-2020-206612","type":"journal-article","created":{"date-parts":[[2020,7,15]],"date-time":"2020-07-15T17:15:31Z","timestamp":1594833331000},"page":"149-156","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":3,"title":["Prolonging fixation time of an alternative fixative to formalin for dermatological samples using standard laboratory protocols"],"prefix":"10.1136","volume":"74","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1135-1191","authenticated-orcid":false,"given":"Julie","family":"Smith","sequence":"first","affiliation":[{"name":"Department of Technology, Faculty of Health and Technology, University College Copenhagen, Copenhagen, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cl\u00e1udia Sofia Antunes Ang\u00e9lica","family":"Faria","sequence":"additional","affiliation":[{"name":"Lisbon School of Health Technology, Polytechnic Institute of Lisbon, Lisbon, Portugal"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Camilla Christine","family":"Qvist","sequence":"additional","affiliation":[{"name":"Department of Pathology, Copenhagen University Hospital (Rigshospitalet), Copenhagen, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Linea C","family":"Melchior","sequence":"additional","affiliation":[{"name":"Department of Pathology, Copenhagen University Hospital (Rigshospitalet), Copenhagen, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas","family":"Lauridsen","sequence":"additional","affiliation":[{"name":"Department of Pathology, Copenhagen University Hospital (Rigshospitalet), Copenhagen, Denmark"},{"name":"Department of Pathology, Zealand University Hospital, Roskilde, Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2020,7,15]]},"reference":[{"key":"2025121220201881000_74.3.149.1","unstructured":"Suvarna SK , Layton C , Bancroft JD . 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