tokens: Among 20 patients who were GAD65 antibody seronegative ( 6 with classic SMS , 12 with partial SMS , and 2 with PERM ) , 15 % ( 3 of 20 ) had at least 1 coexisting autoimmune disease , and 25 % ( 5 of 20 ) had cancer ( 3 with amphiphysin autoimmunity and breast carcinoma and 2 with Hodgkin lymphoma ) .