To compare OS (Overall Survival), defined as the time interval between the date of randomization and the date of death from any cause or the last known alive date;· To compare quality of life measured by EORTC-QLQ-C30· To compare toxicity, graded according to the NCI-CTG criteria;· To compare DFS and OS in patients who achieve or not serum mitotane concentrations > 14 mg/L;· To compare DFS and OS between the 2 arms in patients subgroups stratified according to: type of hormone secretion, stage of disease, histopathologic characteristics.