Fig. 1.

Characterization of the molecular and histopathological features of the index SFT case. a Diagram of the primary and metastatic sites of the index case. b A schematic pre-mRNAs of the fusion variant 2a from the RNA-sequencing experiment. Bottom sequences in black are the reads that map onto the chimeric exon-exon splicing junction. c The fusion variant 2a was confirmed by RT-PCR and Sanger sequencing. d Comparison of CD34, Ki-67, and STAT6 immunohistochemical staining and counterpart H&E staining in the primary and metastatic tissues