4 patients with solid genitourinary tumors and HIV1 infection have been treated in our institution over the last 2 years. Two patients had seminoma, 1 renal adenocarcinoma and 1 renal angiosarcoma. All had deeply impaired immunity with a low CD4 level. 3 had or developed a true AIDS syndrome according to the WHO and CDC criterias of 1988. The remaining patient was seropositive and died less than 3 months following the diagnosis of renal angiosarcoma. He is the first reported case of renal sarcoma in a patient infected with HIV1. 2 patients were homosexuals, and the 2 others were drug addicts. Along with other reported cases, our cases underline the association between the depression of immunity due to HIV and the onset of solid genitourinary tumors.