[defrost]

The lowest rates are in central Africa, places where Cold War uranium was sourced from mines worked by humans with no real protection, etc.

Are the low rates due to healthy living, poor diagnostics, or dying of [other] before the cancer scores a mortality?

[Aachen]

The poorest countries are likely exception cases; compare middle- and high-income countries and there are still odd differences to be observed

[defrost]

Sure - I absolutely agree, Europe, Australia, Canada, the US et al all have excellent medical systems wrt those countries termed "the Global South".