Breast cancer mortality is declining in the United Stares, as well as in ce
rtain other industrialized areas-such as Canada, Austria, Germany, and the
United Kingdom-possibly due to increased utilization of mammographic screen
ing, early detection of disease, and availability of improved therapies. At
least some of the decline has been attributed, however, to the higher fert
ility rates of the cohort of women born between 1924 and 1938 who bore chil
dren during the post-World War II period.
In contrast, certain European nations-Spain, Portugal, Greece, Hungary, Pol
and, and Italy-have not reported these favorable trends.
The lowest breast cancer mortality rates are reported in Asian regions, len
ding researchers to speculate that dietary, cultural, and/or environmental
factors might be implicated in the etiology of the disease.