Well if I were diagnosed with cancer and my doctor said 90% of the time chemotherapy was ineffective but that there are no other treatments, I might still consider doing chemotherapy in case I'm in that other 10% of patients. So it should at least be considered as an option. And this is what every good doctor does with every patient -- presents options, lets you know what the risks and benefits are, and works with you to make decisions.

I would be really upset if the doctor didn't at least let me make an informed decision here, even if you think I'm being anti-science by doing so.