Numerous studies suggest that human SW982 synovial sarcoma cells share similar physiological and immunological properties with primary FLS and that IL-1β stimulation of SW982 cells can mimic the inflammatory status of synovial cells typically seen in RA patients (Tsuji et al., 1999; Kim et al., 2008; Chang et al., 2014). Here, IL1B is linked to synovial sarcoma.