PNMA2 and autoimmune encephalitis: Other autoimmune encephalitis-related antibodies, including other neuron-specific antibodies in the blood and CSF (such as NMDA, CASPR2, AMPA1, AMPA2, LGI1, and GAD65 antibodies related to autoimmune encephalitis and Ri, Hu, Yo, amphiphysin, CV2/CRMP5, and PNMA2 antibodies related to paraneoplastic syndrome), were negative in 12 patients.