NAB2-STAT6 gene fusion and STAT6 immunoexpression in extrathoracic solitary fibrous tumors: the association between fusion variants and locations..     ///    " Solitary fibrous tumor (SFT) is a rare mesenchymal neoplasm harboring NAB2-STAT6 fusion, which drives STAT6 nuclear relocation. "    ///    The clinical aggressiveness of extrathoraic SFTs is associated with malignant histology but unrelated to the NAB2-STAT6 fusion variants. 