Questionable and Unproven Cancer Therapies Barrie R. Cassileth, PhD Surgery, radiation therapy and chemotherapy have been "accepted" cancer treatments for a long time. They are accepted because they were developed after years of study with animals and then humans. The studies were based on logical, scientific principles, and the treatments were then shown to be effective against the growth of tumors in thousands of people. These conventional cancer treatments are responsible for dramatic improve- ments in survival over the past few decades. Where few people used to survive for long after a cancer diagnosis, about half of all diagnosed patients are now cured. Every few years or so, the media present a startling report on some new