GAD1 and autoimmune encephalitis: Of 64 patients, 43 had antibody-proven autoimmune encephalitis with subtypes as follows: NMDA (n = 17, 27%), voltage-gated potassium channel (VGKC) (n = 16, 25%), glutamic acid decarboxylase (GAD) (N = 6, 9%) and other (n = 4, 6%).