TRENDS IN THE INCIDENCE OF OVARIAN-CANCER AND BORDERLINE TUMORS IN NORWAY, 1954-1993

Histology-specific long-term trends in the incidence of ovarian cancer and borderline tumours in Norway were examined, based on data from th e population-based Cancer Registry of Norway. A total of 14,352 cases of ovarian cancer were diagnosed between 1954-1993, of which 94% of th e histologically verified ovarian cancers were epithelial tumours, The age-adjusted incidence rate rose from 10 per 100,000 person-years in 1954-1958 to a peak of 14 per 100,000 person-years in 1984-1988. In wo men older than 50 years, there was an increasing trend in incidence ra tes during the entire study period. From the cohort perspective, the l argest increase was observed among women born between 1870-1899. A tot al of 2,343 borderline tumours was diagnosed between 1970-1993, The ag e-adjusted incidence rate has increased since 1970, reaching 4.8 per 1 00,000 person-years in 1989-1993. (C) 1997 Wiley-Liss, Inc.