Dear Dr. Roach: I read your recent column where you said that ivermectin has not been proven to be an effective treatment for cancer. I feel that you need to be further informed on the positive aspects of Ivermectin. I have on file dozens of testimonials about the cancer-curing properties of ivermectin.

— J.A.

Dear J.A.: Testimonials are not how medical science advances. Medical science advances when careful studies show that a new treatment is proven superior to existing treatments. These need to be done to eliminate the bias of hopefulness (on the part of both the researchers and research subjects), and they need to use objective measures of outcomes. Only after multiple studies have been done (that are often confirmed by other researchers) do new treatments get widely accepted and u

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