From 1975 to 1989, 497 kidneys were transplanted in 431 patients. In this series, 12 tumors were observed in 11 patients (2.7%). There was a prevalence of skin tumors over the other tumor types (33%). The mean time of tumor presentation was 49 months post-transplantation. We investigated the possible influence of immunosuppression on tumor presentation. In our series, immunosuppression therapy was modified in only one case (Kaposi's syndrome), and the initial dose was maintained in the remaining tumors. Of the 11 patients, 5 have died and the remaining 6 patients are alive with a mean follow-up of 34 months.