Clinical trials offer you a chance to try new treatments. Should you participate in a clinical trial? Learn more about how clinical trials work. By Mayo Clinic Staff

Clinical trials are research studies to test ways to detect, prevent or treat disease. You might have a family member involved in a clinical trial, or you might be considering whether a clinical trial is an option for you. Choosing to participate in a clinical trial can be a complex decision. You first need to understand what clinical trials are and how they're used to test new treatments.

Clinical trials look at new ways to prevent, detect or treat disease. Treatments might be new drugs or new combinations of drugs, new surgical procedures or devices, or new ways to use existing treatments. The goal of clinical trials is to determine if a new test or treatment works and is safe. In fact, new medications can't be sold in the U.S. until they've been through clinical trials. Clinical trials can also look at other aspects of care, such as improving the quality of life for people with chronic illnesses.

It depends on the trial, but researchers are typically looking for people who have a specific disease or who are at high risk to develop a certain disease. Some trials are limited to people who haven't started treatment, while others focus on people in whom standard treatment has failed. Healthy people are needed for some trials. Researchers also consider age, sex and race, among other variables, when selecting people for clinical trials.

If treatment for your disease isn't available or if the standard treatment hasn't worked for you, you might consider a clinical trial. Clinical trials can provide access to new or experimental treatments that otherwise aren't available.

However, there's no guarantee that the treatment will work for you or even that you'll receive it. Some participants in clinical trials get a placebo — a pill or liquid that looks like the new treatment, but has no active ingredients. Using placebos give researchers something to compare with the drug being tested. You can't control whether you receive the placebo or the new treatment. Not all clinical trials have a placebo component, as some clinical trials compare two different active treatments. Ask your doctor if there is a possibility you will get a placebo.

Despite these caveats, clinical trials offer hope for many people and an opportunity to help researchers find better treatments for people in the future.

Your doctor might recommend a clinical trial to you, or you might find out about a trial on your own. A good place to start is the National Library of Medicine clinical trials website. You can also find information about clinical trials by visiting the websites of medical groups, such as Mayo Clinic.

Once you find out about a trial you're interested in:

  • Talk to your doctor. Your doctor might be familiar with the drug or therapy involved in the trial. Your doctor can discuss with you the benefits and risks of the clinical trial and whether you might be eligible to participate.
  • Contact the clinical trial coordinator. This person is often listed with the clinical trial announcement. You or your doctor can talk with the study coordinator about your health and whether you meet the criteria for the study.
  • Schedule a pretrial screening. At the screening, you'll undergo various tests to determine whether you qualify for the clinical trial. You'll also get a chance to talk to the investigators about what the trial involves, as well as its risks and benefits.

Before you agree to participate in a clinical trial, make sure you know the answers to these questions:

  • Who is in charge of this study?
  • Do the people running the study have a vested interest (conflict of interest) in the outcome?
  • What is this study trying to find out?
  • What will be expected of you?
  • Is it possible that you might receive a placebo?
  • What benefits or risks can you expect if you take part in this study?
  • How long will the study last?
  • What happens if your condition gets worse during the study?
  • Can you continue seeing your own doctor during the study?
  • Will you need to pay for any part of the study, including doctor visits and routine tests?
  • Who pays if you're unexpectedly injured during the trial?
  • How will your participation in the study affect your daily life?
  • What happens at the end of the study?
  • Will you be told the results of the study? When?
  • Who will know that you're participating in the study?

The same ethical and legal rules that govern medical practice apply to clinical trials. In addition, most clinical research is federally regulated with safeguards to protect the participants. Clinical trials must follow a scientific action plan called a protocol. The protocol explains what will be done in the study and why. It outlines:

  • Who may participate
  • How many people will take part
  • What the treatment plan entails
  • The type and frequency of tests
  • How the results will be measured
  • The reasons that a study may be stopped
  • The situations in which researchers may stop giving the treatment to participants
  • The likely or known side effects of the treatment
  • The possible benefits of the treatment

The organization that sponsors the study, such as the medical center where the work will be done, must approve the protocol. In addition, an institutional review board must review the protocol to be sure that participants are treated humanely and ethically, and to evaluate whether the likely benefit of the treatment is worth its risk. The review board also checks to see if any of the researchers have substantial conflicts of interest.

A clinical trial may also have a data safety monitoring board overseeing it. As the name suggests, this board monitors the safety of the study participants. The data safety monitoring board can stop a study at any time if it seems that the treatment isn't working or it's causing too many side effects. A trial can also be halted by the board if the treatment is proving to be better than the standard treatment and therefore should be made available to people outside of the clinical trial.

Informed consent is the process of learning the key facts about a clinical trial before deciding whether or not to participate. During this process, you learn about the purpose of the trial, as well as key details such as:

  • What will happen during the clinical trial, including planned tests
  • Known risks and benefits of the experimental treatment
  • How long you'll be expected to participate in the clinical trial
  • Other treatments that might be helpful to you instead of the treatment being tested
  • Whom to contact with questions

You must sign an informed consent form to take part in a clinical trial, but it isn't a contract. If you later decide to leave the study, you can do so at any time.

If your child will be enrolled in a clinical trial, you will go through the informed consent process together. As the parent or guardian, you will have to give permission for your child to participate. Depending on your child's age, researchers may also ask your child directly if he or she agrees to be in the study.

By participating in a clinical trial, you can gain access to new research treatments and help others by contributing to medical research. However, clinical trials aren't without risks. For one thing, the experimental treatment may not work for you. Or you may experience unpleasant, serious or even life-threatening side effects. If you're considering a clinical trial, it's essential to get all the facts and to talk with your doctor about the potential risks and benefits.

Jul. 02, 2011