Changes in the Incidence and Survivals of Ovarian Cancer in Poland.

The incidence and mortality trends, as well as survivals, are presented according to the Warsaw Cancer Registry data concerning 4,112 ovarian cancer cases registered in the years 1963-1988, in two populations, the urban of Warsaw City and the rural of the Warsaw Rural Areas (WRA). The standardized incidence rate in Warsaw in 1988 was 13.44/100,000 and it has not changed significantly in relation to the 1963 figure, but statistical significance characterized the increase of incidence in WRA population and the general population of Poland. The standardized incidence rates were as follows: WRA 1963 6.8, 1988 11.7; in Poland as a whole respectively, 6.5 in 1960 and 11.7 in 1988. The most rapid increase of incidence occurred in the 1960s, then the trend stabilized, and another increase began in 1984. The incidence growth was accompanied by similar trends in mortality. The mortality rates in 1988 were: 8.3 in Warsaw; 6.9 in Poland, and 6.9 in WRA. The mortality increase was statistically significant in WRA and in the total population of Poland. The analysis of mortality and incidence trends in Warsaw City and in Poland as a whole justifies the identification of Warsaw as a high-risk population, while Poland appears to be a population of rapidly growing ovarian cancer risk. Despite a statistically insignificant growth of ovarian cancer incidence and mortality in Warsaw, the risk keeps increasing as can be seen in the permanent increase of incidence and mortality rates which began in 1973, in increasingly age-specific incidence and mortality rates in almost all age groups, and in a shift of top incidence and mortality rates towards younger age groups. The risk of this cancer is higher in Warsaw City than in rural areas, but the urban/rural ratio was declining from 2.5 to 1.3 during the study period. The relative 5 years survival rates in Warsaw are similar to those observed world wide, and they are 37.3% against 38.5% in WRA. Compared with the previous period between the years 1963 and 1968, there has been an improvement in the 5-year survival rates in both populations and in all age groups, except the oldest, resident in Warsaw.