How sophisticated is our understanding of cancer?

We have come a long way in our understanding of cancer. We(through scientific research) have been able to narrow down many of the causes of cancer.We have been able to figure out what is happening to the healthy function of cells, why do they go rogue and become an abnormal cell or an altered cell(bad ). Through this understanding we are able to detect cancer cells sooner and have also been able to make medicine that is better engineered to kill the bad cells and not as many of the good ones. Although I may not choose to use only western medicine, if I had cancer, I am very grateful for it's existence ( it cured my brother).