Diagnostic utility of FOXO1 immunohistochemistry for rhabdomyosarcoma classification.
Cooper D RutlandJodi GedallovichAihui WangSabrina ZdravkovicSushama VarmaJason L HornickGregory W CharvillePublished in: Histopathology (2023)
Taken together, our findings suggest that FOXO1 immunohistochemistry is a highly sensitive and relatively specific surrogate marker of the PAX3/7::FOXO1 fusion oncoprotein in rhabdomyosarcoma. Cytoplasmic immunoreactivity, expression in nonneoplastic tissues, and limited nuclear staining of nonalveolar rhabdomyosarcomas represent potential pitfalls in interpretation.