Trends in incidence, treatment and survival of borderline ovarian tumors in the Netherlands: a nationwide analysis

AbstractBackground: Population-based data on borderline ovarian tumors (BOTs) are scarce and information regarding recent trends in incidence, treatment and survival is lacking. The purpose of this study was to analyze these trends in the Netherlands and to assess the risk of developing a subsequent invasive ovarian tumor.Material and methods: All consecutive patients diagnosed with BOTs between 1993 and 2016 (n = 7113) were identified from the Netherlands Cancer Registry (NCR). Annual age-adjusted incidence rates were calculated. Relative survival (RS) analyses and multivariable analyses estimating excess mortality were conducted. Patients with a subsequent invasive ovarian tumor were identified by the NCR.Results: Age-adjusted incidence increased from 2.1/100,000 person-years in 1993 to 4.2/100,000 in 2011, after 2011 the incidence declined. The proportion of bilateral tumors decreased over time from 16% in 1993–1998 to 11% in 2005–2010 and remained stable onwards. Survival improved over time (excess mo...