Why don't scientists do research on the blood cell that are effect by the cancer instead of the cancer?

Why don't scientists do research on the blood cell that are effect by the cancer instead of the cancer?
Cancer is simply a big cash cow for the medical profession. It doesn't event what they study. After billions of dollars and poor slobs running marathons for cancer they aren't any closer than they were fifty years ago. They articulate the same as fifty years ago: impulsive diagnosis and surgery. Chemo and the rest is just voodoo.
And you know for a reality that they AREN'T? You think that they haven't thought of that?
to the alleged colonel: "Chemo and the rest" save my freakin life, so shove it.