GAD2 and cancer: The antibodies seen in the 7 cases without a detectable cancer were ganglionic acetylcholine receptor (AChR) antibody (n = 3), ANNA-1 (2), voltage-gated potassium channel (VGKC) antibody (1), and VGKC, ANNA-1, and glutamic acid decarboxylase (GAD)-65 (1).