I think that overall much has to do with how aggressive a particular cancer is, and how strong a person's immune system is.
One person with a weak immune system might survive a milder form of cancer, whereas someone with even a strong immune system might succumb to a really aggressive form of cancer.
scientificamerican.com/article.cfm?id=clues-to-aggressive-stubb
utsouthwestern.edu/findfac/research/0,2357,39254,00