If the age‐adjusted incidence rate of breast cancer among the grandchildren of Japanese immigrants to the USA is much closer to that of American women (high
Rates) than Japanese women (low rates) what does this tell us?
A)The most important causes of breast cancer are genetic
B)The most important causes of breast cancer are environmental (i.e.not genetic)
C)Breast cancer is diagnosed more accurately in the USA
D)Dietary change is the most likely explanation for the increase in risk among migrants
E)Women who think they are at risk of breast cancer are more likely to move to the USA

Question

Quizplus · Accepted Answer

The most important causes of breast cancer are environmental (i.e.not
genetic).If breast cancer rates among the Japanese immigrant population have gone
from low to high in two generations this suggests that the main causes are not genetic
(because a genetic change cannot happen this quickly).It tells us nothing about the
accuracy of diagnosis or about the women who move to the USA.Nor does it give us
any data on what important factors differ in the different environments; diet may be
one of the causes, but it requires further analytic studies to test the theory directly.

If the Age‐adjusted Incidence Rate of Breast Cancer Among the Grandchildren