Study highlights processing effects on canine bone marrow IHC
CURRENT BRIEF VERSION: A new Veterinary Pathology study examined how fixation and demineralization methods affect immunohistochemical assessment of canine bone marrow, a practical issue for labs working up marrow biopsies from dogs with hematopoietic disease. The study, by Gabriella M. L. Diamantino, Janet Beeler-Marfisi, and Robert A. Foster, evaluated sternal bone marrow collected within 24 hours of death, comparing acetic acid-zinc-formalin with 10% neutral-buffered formalin, then testing hydrochloric acid, formic acid, and EDTA demineralization. The paper builds on the same group’s 2024 work showing that EDTA preserved marrow histomorphology and DNA amplification better than acid-based decalcification, while neutral-buffered formalin performed at least as well as AZF for downstream testing. That broader point also aligns with work outside routine marrow diagnostics: for example, a recent Animals paper described a simple EDTA-based digestion and extraction approach that generated high-quality DNA and complete microsatellite genotypes from all 60 tested deer antler and prepared trophy skull samples, underscoring how well EDTA-based processing can support molecular recovery from mineralized tissues. More broadly, pathology guidance in both veterinary and human literature has consistently favored formalin fixation plus gentle EDTA decalcification when immunohistochemistry or molecular assays may be needed. (pubmed.ncbi.nlm.nih.gov)
Why it matters: For veterinary professionals, especially clinical pathologists, oncologists, and diagnostic labs, preanalytic handling can change whether a marrow sample is truly interpretable. If acid decalcifiers weaken antigen preservation, that can translate into false-negative or less reliable immunolabeling, complicating immunophenotyping, marrow staging, and follow-up molecular work. And the implications are not limited to staining alone: evidence from other mineralized tissues suggests EDTA-based processing can also preserve DNA quality well enough for reliable downstream genotyping. The practical takeaway from the surrounding evidence is straightforward: when turnaround time allows, neutral-buffered formalin fixation and EDTA-based demineralization are the safer choices for preserving diagnostic flexibility. (academic.oup.com)
What to watch: Watch for whether veterinary diagnostic labs update marrow processing protocols or validation panels in response to these findings, especially for cases where IHC and PCR may both be requested. (pubmed.ncbi.nlm.nih.gov)