Side effects may be particular to the patient. Depending on the type of treatment, method of administration, and the patient's condition, some drugs used in clinical trials can cause side effects and pose potential risks for those involved. By virtue of the nature of scientific studies, the likelihood of this may not be known before the experiment begins. However, researchers are constantly studying trends in treatments and outcomes to further knowledge about side effects. Trials can produce unexpected outcomes but also desired results.

The trial physician or nurse will supply information about the disease, current treatments and the new drug candidate. The risks and hoped-for benefits are spelled out for the candidate participants. If you decide to participate, you will be asked to sign an informed consent form.
Before you sign:

	Be sure you are aware of the possible risks involved
	Be sure you understand the terms and vocabulary on the form and those used by the physician; if you don't understand any portion of the form or have other concerns, don't be afraid to ask questions!
	Ask the doctor to clarify any procedures or roles that are unclear

If you decide not to participate, you have every right to refuse. Regardless of whether or not you sign the form, you are free to leave the trial at any time, and can seek medical treatment elsewhere.