Well now you're just making things up. It's not my cancer survival rate number, it's the number published by the CONCORD programme in the London School of Hygiene & Tropical Medicine. If you had bothered to read the article I linked above then you wouldn't need to doubt because you would know exactly what they factored in.
I did check it, it does not appear to mention this factor at all. I would assume then that they are focusing only on individuals who were able to actually get treatment, since this seems to be the survival rate among patients in treatment.
