The aim of this study is to collect data on Korean patients with borderline ovarian tumors.
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Inclusion Criteria: * Patients with borderline ovarian tumors (BOTs) diagnosed, treated, and followed between November 1994 and February 2015 at institutions where placed in the Republic of Korea. * All patients undergoing gynecologic surgery for BOTs at institutions where placed in the Republic of Korea since March, 2015 Exclusion Criteria: * Patients who did not receive primary treatment or follow-up for at least 6 months at each institution were excluded from analysis