Fair enough, but I see cell biology advances as a by-product of cancer research as in "how does this cancerous cell react to this candidate drug ?" instead of "why does a healthy cell go havoc ? Why is the immune system unable to detect and destroy a cell gone havoc ?"
I see what you're saying but it's not really just a by-product, it's an integral part of the research. Both the "why" and the "how" are needed, especially when looking at rational drug design to have specific targets to screen for.
Yes, the trigger for carcinogenic mutations is mostly environmental influence - some of which can be controlled and some of which can't - but that's no reason to cease funding research into the actual cellular mechanisms of cancer.