Surgery is the essential element of staging and treatment of malignant
ovarian tumours. Regardless of the stage, it must include peritoneal
cytology, hysterectomy with bilateral adnexectomy, omentectomy, pelvic
and lumbo-aortic lymphadenectomy, appendicectomy and multiple periton
eal biopsies. In stage I tumours, in young women desiring a subsequent
pregnancy, preservation of the uterus and contralateral ovary can be
proposed. In stages II, III and IV, the therapeutic strategy consists
of primary surgery and systematic chemotherapy (6 cycles). Radical sur
gery is essential in these cases, as the size of the residual tumour a
t the end of operation constitutes the major prognostic factor. To opt
imize the quality of tumour debulking, the maximum of visible carcinom
atous nodules must be resected with, if necessary, gastrointestinal re
sections. The value of second-look surgery, after 6 cycles of chemothe
rapy, is currently controversial: it is only indicated in the context
of randomized trials. Borderline malignant ovarian tumours have a good
prognosis regardless of their stage. Surgery can very often be conser
vative, particularly in young women. Adjuvant chemotherapy has been sh
own to be effective in these rumours. Many studies are underway to def
ine the value of new cytostatic molecules and ''interval'' surgery (in
tercalated between several courses of chemotherapy).