NAB2 and solitary fibrous tumor: The fusion gene NAB2::STAT6 confirms a morphological diagnosis of SFT in cases with inconclusive STAT6 immunoreactivity [1,2,3,15,16,17,18,19,20,21,22,23,24,25,30,31,32,33,34,35,36,37,38,39,40,41,42,43].