STAT6 and solitary fibrous tumor: Histologically, SFT is characterized by a prominent, branching, thin-walled, dilated (staghorn) vasculature.3) The tumor cells are typically short and spindle-shaped, exhibiting a high N/C ratio and relatively scant cytoplasm.3) In 2013, the NAB2–STAT6 fusion gene was identified in the majority of SFT cases, providing a pivotal molecular hallmark for this tumor entity.18,19) Subsequently, the 2020 revision of the WHO classification of soft tissue tumors incorporated the presence of this fusion gene as a defining diagnostic criterion for SFT.