Results: SV1 expression was cytoplasmic and was detected in 6/8 malignant (75 %) and 11/11 (100 %) Warthin tumors. However, only 1/11 (9 %) pleomorphic adenomas expressed SV1 (p<0.05, x2-test). Immunoreactivity ranged from mild to intense in all positive specimens, with the exception of Warthin tumors at which only intense immunoreactivity was recorded.