I don't understand the point you're trying to make. [Treatable] cancer isn't the leading cause of death in any country[0], so no matter how good (or bad) a country is at treating cancer, you wouldn't expect that to be visible in the overall life expectancy rates.

[0] Ordinally, cancer is #2, but that includes untreatable cancers, and the tail is very long, so getting better at improving five-year survival rates for cancers won't budge your life expectancy at all, outside of the margin-of-error.