SOX1 and small cell lung carcinoma: In the remaining 71 patients with CBA SOX1 autoantibodies (30 with PNS and SCLC from the initial study and 41 referred to our laboratory for antibody testing) the immunohistochemistry on rat cerebellar sections showed the pattern compatible with AGNA antibodies in 50 of 60 (83%) sera, and the other 11 cases were not assessable due to co-existence of other immunoreactivities.