No.	Recommendations/Statements	GR	LoE	Sources
11.1.	Borderline tumours must be distinguished according to the WHO classification and categorised into subtypes. This should include the categorisation of any existing implants (invasive – non invasive) as well as information about microinvasion.	CC		184
11.2.	Careful surgical staging is necessary and, in addition to complete removal of the tumour (including bilateral salpingo-oophorectomy), should include inspection of the abdomen with peritoneal wash cytology, resection of all abnormal areas, peritoneal biopsies of unremarkable areas and omentectomy.In mucinous borderline tumours, metastasis of extraovarian tumours must be excluded; an appendectomy is necessary to exclude a primary appendiceal neoplasm.	B	2+	Primary studies: 185, 186, 187, 188, 189
11.3.	There are some indications that performing cystectomy instead of ovarectomy and carrying out a fertility-preserving procedure instead of bilateral salpingo-oophorectomy is associated with higher rates of recurrence.	ST	2+	Primary studies: 190
11.4.	If the patient wishes to have children/wishes to preserve endocrine functions, a fertility-preserving procedure can be carried out. The patient must be informed about the increased risk of recurrence associated with this procedure.	0	2+	Guidelines: 2 Primary studies: 191
11.5.	There is no persuasive evidence for the effectiveness of adjuvant therapy for the treatment of borderline tumours.	ST	1+	Guidelines: 2 Primary studies: 192
11.6.	Patients with borderline tumours must not receive adjuvant therapy.	A	1+	Guidelines: 2 Primary studies: 192