FWIW, I looked into this using the tables on http://www.worldlifeexpectancy.com/cause-of-death/all-cancer... - not just the all cancers table, but also the separate tables for different types of cancer. The implication of what you write - that the US has better medical healthcare - didn't seem to stand out. Rather, it looked like different European countries have markedly different death rates from different cancers. Things like diet, lifestyle, prevalence of smoking, etc. seem like a better explanation for the variance. France has especially low heart disease deaths, for example, but slightly higher cancer deaths than the US. Etc.
And of course we all die of something, so I would expect cancer deaths to be higher in a country with a higher life expectancy even if the medical success in treatment was higher. Third world countries generally do not have high deaths from cancer.