EWSR1 and primary progressive multiple sclerosis: In Table 2 (Nicholson et al. 1999; Wu et al. 2021; Thway et al. 2011; Matsukuma et al. 2012; Chen et al. 2020; Inayama et al. 2001; Smith et al. 2014; Jeon et al. 2014; Kim et al. 2017; Yanagida et al. 2017; Agaimy et al. 2017; Koelsche et al. 2020; Opitz et al. 2019; Nishimura et al. 2023; Prieto-Granada et al. 2017), which compiles the 39 PPMS cases, FISH analysis was performed in 34 cases, revealing a positive EWSR1 gene rearrangement rate of 85% (29/34).