CD248 and synovial sarcoma: Consistent with our data, Rouleau et al (2008) reported endosialin protein expression in sarcoma cells in 80% (8/10) of synovial sarcomas, 75% (6/8) of fibrosarcomas, 73% (8/11) of UPS and 10% (1/10) of RMS, with similar results obtained in an independent series (O'Shannessy et al, 2016).