This finding of strong and diffuse nuclear STAT6 immunoreactivity has previously been implemented in many laboratories as a surrogate for the molecular analysis in solitary fibrous tumors considering the good correlation between the nuclear STAT6 overexpression and the presence of the NAB2/STAT6 fusion gene [1,2,3,4,5,6,7,8,42]. Here, STAT6 is linked to solitary fibrous tumor.