There are three kinds of clinical trials. In the 3rd type of clinical trial, you are not being a lab rat. You are involved in a treatment that has already been found to be valid and successful, but trial's purpose is to see if it's BETTER than the present standard treatment. However, it is already thought to be SUCCESSFUL. The only question is if it's BETTER than the current STANDARD TREATMENT, and how much better, if that can be determined. Don't be afraid of being a lab rat... but do find out which level trial it is (one, two or three)...