Notably, 12 antibodies of paraneoplastic neurological syndromes (PNS) (Hu, Yo, Ri, PNMA2, CV2, Amphiphysin, anti-Tr/DNER, GAD65, ZIc4, Titin, SOX1, and Recoverin; examined using an immunoblotting method by BML Inc.)and anti-ganglioside antibodies including anti-ganglioside complexes in the serum were all negative on day 22. Here, RCVRN is linked to paraneoplastic neurologic syndrome.