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CHRONO: randomized trial of the CHROnology of surgery after Neoadjuvant chemotherapy for Ovarian cancer


Background In patients treated for advanced ovarian cancer not suitable for complete primary surgery, interval surgery after three courses of neoadjuvant chemotherapy has been considered standard management since the EORTC randomized trial published in 2010. An alternative approach with delayed surgery after six courses of neoadjuvant chemotherapy was reported in retrospective series.

Primary Objectives To assess the efficacy on progression free survival of interval cytoreduction surgery after three cycles of neoadjuvant chemotherapy compared with delayed surgery after six cycles of neoadjuvant chemotherapy.

Study Hypothesis In women with ovarian cancer not suitable for primary surgical cytoreduction, surgery after six cycles of neoadjuvant chemotherapy will prove better disease-free survival than cytoreductive surgery after only three cycles.

Trial Design CHRONO is a multicenter, randomized phase III trial. After three courses of neoadjuvant chemotherapy, eligible patients will be randomized (1:1) to either completion surgery followed by an additional five cycles of chemotherapy (control arm) or an additional three cycles of neoadjuvant chemotherapy followed by completion surgery and then two additional cycles of chemotherapy (experimental arm). Patients in both groups will receive eight total cycles of chemotherapy.

Major Inclusion/Exclusion Criteria The main inclusion criteria are histologically confirmed epithelial high-grade serous or endometrioid ovarian cancer, documented FIGO stage IIIB–IVA unsuitable for complete primary surgery but considered resectable after three courses of neoadjuvant chemotherapy. The main exclusion criteria are mucinous, clear cell, carcinosarcoma, or low-grade serous histologies.

Primary Endpoint The primary endpoint is progression-free survival.

Sample Size 210 eligible patients

Estimated Dates for Completing Accrual and Presenting Results The estimated date for completing accrual will be Q2 2023. The estimated date for presentation of the first results is Q3 2028.

Trial Registration Number NCT03579394.

  • Surgery
  • Ovarian Cancer
  • Gynecologic Surgical Procedures

Data availability statement

All data relevant to the study are included in the article.

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