Paraneoplastic antibodies and an autoimmune panel (ANCA-c, ANCA-p, anti-phospholipid IgG, anti-NMO, anti-SSA/Ro, anti-SSB/La, anti-dsDNA) were negative, and only serum anti-NMDAR antibodies showed a positive result. The gene discussed is SSB; the disease is neuromyelitis optica.