The man in the street has unfortunately been sold the idea that the breakthrough cure for cancer is just around the corner... The very prospect of effective treatment seems so remote that it doesn't even enter into the speculative day-to-day conversation of people engaged in cancer research... New treatments have not produced any detectable decline in the total annual cancer mortality, even for children.
Aside from certain rare cancers, it is not possible to detect any sudden changes in the death rates for any of the major cancers that could be credited to chemotherapy. Whether any of the common cancers can be cured by chemotherapy has yet to be established.