NCIt definition : A fusion gene that results from a chromosomal rearrangement that fuses exon 4 of the
WWTR1 gene on the long arm of chromosome 3 in frame with exon 2 of the FOSB gene on
the long arm of chromosome 19. This rearrangement is associated with pseudomyogenic
hemangioendothelioma and deregulation of protein fosB transcriptional activation activity.;