I think when it comes to cancer, the idea of finding a cure may be a bit different than other diseases. There will never be one cure for all cancers, but if we look at each type of cancer with certain features as separate from other cancers, cures for these subtypes are more likely. Look at something like herceptin, which is basically a cure for estrogen receptor positive breast cancer. It will be a long time however before we get cures for all types and subtypes of cancer.
To those worried about companies not wanting a cure, to some extent that is a valid concern. There are actually several treatment drugs in clinical trials for leukemia (and one already available) that do not cure, just control the cancer. Companies really like this type of thing, because you have to keep taking the treatment for life. If this trend continues into other types of cancer, it will in the end be up to university researchers, who have less money to work with, to move from controlling to curing cancer.
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