What evidence do you have that demonstrates that the lowest mortality rate for breast cancer has nothing to do with its healthcare system?

You mean in Japan? are you testing me, TH? ;-)

OK. The average western incidence of breast cancer is close enough to 300% of the Japanese. So you'd expect the Japanese mortality rate to be lower just because there are fewer cases, not because its health system is 300% as good at treating breast cancer. Equally, as the incidence of breast cancer rises in Japan you can expect mortality to rise.

FWIW, stats suggest that the incidence of breast cancer in the West rose 35% between 1970 and 1990 and more recent stats from the Geneva Cancer Registry report a 45% *annual* increase in breast cancer in younger women. Also there are anecdotal reports that young women are presenting with advanced gynae cancers that used not to be seen until much later. We're talking women in their 20s who die within months. Presumably there are protective and causative agents that we do not fully understand yet.