While I am sure there are abuses with a market share that big, I can tell you from personal experience watching several friends go through Chemo and beat cancer. I hope and pray that better, less intense treatments appear but the cancer death sentence of when I was growing up has, to some extent, abated. I wish nobody to have to go through that but I am heartened that the success rates are climbing.
One day we will look back on chemo as being the toxic primitive treatment it is. But we don’t have a ton of alternatives and “medicine” focuses only on pharmaceuticals (other than structural treatments like surgery and bone muscle repairs).