Detection of c4d deposition in cardiac allografts a comparative study of immunofluorescence and immunoperoxidase methods

Dylan V. Miller, Anja C. Roden, Jeffrey D. Gamez, Henry D. Tazelaar

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Complement activation, evidenced by deposition of C4d, is important in the diagnosis of antibodymediated rejection of cardiac allografts. C4d deposition can be assessed by either immunofluorescence (IF)- or immunoperoxidase (IP)-based methods. The use of methods varies considerably among institutions, but there are few data addressing their diagnostic equivalence. Objective.-To compare IF and IP C4d staining on paired endomyocardial biopsy samples from a large number of heart transplant patients. Design.-Retrospectively selected paired frozen and paraffin-embedded samples from the same biopsy were stained for C4d by IF and IP methods. Capillary staining was scored by using a 0, 1 , 2 , 3 scale. Results.-A total of 296 biopsy pairs from70 patients were studied. There were two hundred forty-three cases that were scored 0, twenty-four scored 1 , sixteen scored 2 , and thirteen scored 3 by IF. Two hundred thirty-one cases scored 0, forty scored 1 , ten scored 2 , and fifteen scored 3 by IP. Complete agreement was seen in 81%of cases.Among discrepant cases, 89%(n = 51) were minor (± 1) and 11% (n = 6) were major (± 2). Five of the 6 major discrepancy biopsies came from2 patients, both ofwhomhad concordant (IF and IP) 3 results on prior biopsies. The weighted k value for the entire sample set was 0.78 and for the first biopsy only set (to correct for bias introduced by multiple biopsies from the same patient) the weighted k value was 0.88. Conclusions.-Immunofluorescence and IP C4d staining methods are highly comparable and are both viable options for antibody-mediated rejection surveillance in transplant heart biopsies. (Arch Pathol Lab Med.

Original languageEnglish (US)
Pages (from-to)1679-1684
Number of pages6
JournalArchives of Pathology and Laboratory Medicine
Volume134
Issue number11
StatePublished - Nov 1 2010

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Medical Laboratory Technology

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