LGI1 and neoplasm: Compared to other types of autoimmune encephalitis, the 2 years fatality rate of anti-GABABR encephalitis is significantly higher than that previously reported for anti-NMDAR encephalitis (6%) (13) and anti-LGI1 encephalitis (19%) (20), which may be because patients with anti-GABABR encephalitis have a higher risk of a tumor.