GAD2 and neoplasm: Pertinent laboratory findings in these patients included the autoantibodies against NMDA receptors (28), GABAA receptors (1), GABAB receptors (2), voltage gated potassium channel complex (VGKC, 7), contactin-associated-protein (CASPR,1), type 1 anti-neuronal nuclear protein (ANNA-1, anti-Hu, 1) and GAD-65 proteins (8) in the serum or CSF; however, the tumor status of patients was not consistently recorded.