One hundred and fifty patients with malignant ovarian tumors were treated in the Cancer Institute Hospital between 1949 and 1977. Most (103; 68.7%) of the patients had simple primary ovarian cancer. A retrospective study was performed in these 103 patients to investigate the relationship between the 5-year survival rate and the clinical stage and primary treatment. The 103 patients were classified according to FIGO criteria. The survival rates for stages I, II, III and IV were 73.7%, 50.5%, 17.4% and 0%, respectively. As the primary treatment, operations were performed on 92 of the 103 patients. To conclude, of primary importance in the treatment of ovarian cancer is the surgical, complete as possible removal of the tumors. Postoperatively, radiotherapy and chemotherapy should be used. Recently, second look operations have come into wider use. General procedures for the surgical and postoperative treatment of progressive ovarian cancer have been established. Although surgical procedures for the treatment of early ovarian cancer have also been established, there are no consistent procedures for postoperative treatment. Since the incidence of ovarian cancer is increasing, the development of appropriate methods for early diagnosis and treatment of this carcinoma is eagerly awaited.