The goal of this observational study is to pre-test the EORTC QLQ-OV39 to identify and resolve potential problems in its administration and to identify missing/redundant items. A preliminary evaluation of the measurement properties of the module will be carried out.

The study includes patients with evidence of localized (FIGO I-II) or advanced ovarian cancer (FIGO II-IV) above the age of 18 years.

The main aims are:

1. To conduct Phase 3a and 3b pre-testing of the preliminary EORTC-QLQ-OV39 Questionnaire to identify and resolve potential problems in its administration and to identify missing/redundant items according to the updated EORTC QLG Guidelines for Module Development, 5th Edition 2021.(16)
2. a preliminary assessment of the psychometric properties of the module

Participants will [describe the main tasks participants will be asked to, complete the OV39, C30 and debriefing interviews, as well as questions about their demographics and clinical data.](streamdown:incomplete-link)

Follows.

Inclusion Criteria:

1. Evidence of localized (FIGO I-II) or advanced ovarian cancer (FIGO II-IV)
2. Must be able and willing to complete the questionnaires.
3. Must be able to understand and speak the language in which the patient will complete the questionnaire.
4. Age > 18 years

Exclusion Criteria:

• cognitive impairment

Ovarian cancer patients from collaborating centers

Individual participant data are not publicly available due to privacy restrictions and ethical considerations