If an alternative treatment existed for a terminal illness, would you recommend it to a patient, even if there were no scientific evidence to support its efficacy?

"I recently read a piece of research stating that nearly 70% of cancer patients use alternative therapies in conjunction with their traditional treatment. As most physicians know, many of these alternative therapies can be dangerous, even if they are 'natural.' Some specific herbs and supplements can interfere with chemotherapy and reduce its efficacy. There is no way I could ever know all the causes and effects of alternative treatment, so if there were no scientific evidence to support its effectiveness, I would not recommend it."