NFKB1 and synovial sarcoma: Indeed, several genetic variants in regulators of the transcription factor NFκB are associated with SS patients (Lisi et al., 2012; Nordmark et al., 2013; Ou et al., 2008; Sisto et al., 2013), and a mouse strain containing similar variants recapitulates some of the SS pathognomonic characteristics (Peng et al., 2010).