In this study, we validated the existence of the NAB2-STAT6 fusion gene in SFTs and examined its relation with the pathological features.     ///    "In addition, 1 of the 2 NAB2-STAT6 fusion gene-negative tumors showed amplification of the MDM2 and CDK4 genes. "    ///    " Recently, a novel fusion transcript, NAB2-STAT6, and its variants have also been reported to be specific diagnostic markers for solitary fibrous tumors (SFTs). "    ///    "It was suggested that a certain proportion of tumors previously diagnosed as malignant SFTs with high-grade nuclear atypia lacking NAB2-STAT6 should be categorized into a special subtype of SFT, which is genetically different from conventional SFTs, and which cannot be apparently distinguished from dedifferentiated liposarcoma or undifferentiated pleomorphic sarcoma. "