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Immunohistochemistry for PAX7 is a useful confirmatory marker for Ewing sarcoma in decalcified bone marrow core biopsy specimens.
Virchows Archiv : An International Journal of Pathology 2018 December
PAX7 has been recently demonstrated to be a highly sensitive marker for Ewing sarcoma, and thus far has only been shown to label a relatively small set of other mesenchymal neoplasms. Because the processing of bone marrow core biopsies can often hinder the performance of immunohistochemical stains, we set out to determine if our laboratory's PAX7 staining protocol effectively detects Ewing sarcoma in Bouin's fixed, decalcified bone marrow core biopsies. We stained ten core biopsies involved by Ewing sarcoma, nine non-involved core biopsies, and 13 core biopsies involved by histologic mimics of Ewing sarcoma. Only the ten biopsies involved by Ewing sarcoma and four biopsies with rhabdomyosarcoma showed strong nuclear PAX7 staining. None of the other tumors demonstrated PAX7 expression. This study demonstrates that the PAX7 staining protocol used in our laboratory is a useful marker for Ewing sarcoma and other PAX7-positive tumors in decalcified bone marrow core biopsies.
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