Or maybe cancer is quite a complex disease that requires a...

Or maybe cancer is quite a complex disease that requires a multitude of different advances that takes a long time, due to the need for patient recruitment, safety and efficacy proof via clinical trials. Cancer is heterogeneous, which means that it has different subtypes in the same cancer, hence why there is always a breadth of responses in each therapy.

unfortunately, until researchers and clinicians who trial new drugs can target the breadth of different genetic mutations, they need a broad therapy toxic drug that does unfortunately kill healthy cells. This is chemo.