TNFSF13B and autoimmune disease: It has been reported that serum BAFF levels are increased in many autoimmune disorders, including MG (Kang et al. 2016; Kim et al. 2008; Migita et al. 2010; Ragheb et al. 2008; Scuderi et al. 2011; Thangarajh et al. 2006; Vannucchi et al. 2012).