A novel SERPINE1-FOSB fusion gene results in transcriptional up-regulation of FOSB in pseudomyogenic haemangioendothelioma..     ///    "Further studies are needed to understand the cellular impact of the aberrant expression of the FOSB gene, but as the t(7;19) resulting in the SERPINE1-FOSB fusion seems to be pathognomonic for PHE, FISH or RT-PCR could be useful for differential diagnostic purposes.. "    ///    Interphase FISH on sections from eight additional PHEs identified the same SERPINE1-FOSB fusion in all cases. 