What are the different types of clinical trials?
There are many types of clinical trials.
- Treatment trials test new treatment options. For example, treatment trials for bone marrow failure may study a new medicine. Or, the study may look to find a new use for one or more drugs that are already being used. Treatment trials make sure a treatment is safe and effective before it is approved for wider use.
- Diagnostic trials test and evaluate new ways to diagnose a disease.
- Screening trials test the best way to detect a disease or health problem.
- Quality of life trials are also called supportive care trials. They study ways to improve the comfort and life quality of people with a long-term illness.
- Prevention trials look for better ways to prevent disease in people who have never had the disease. They may also explore ways to stop a disease from coming back. These trials may include using medicines, vaccines, or vitamins, or making changes in lifestyle.
What are the phases of clinical trials?
A new treatment must first be tested in a lab or in animals before it is tested in people. Then, before a treatment can become part of standard treatment, it must first go through 3 or 4 clinical trial phases. Each phase has a different purpose and helps scientists answer different questions.
You do not have to take part in all the phases. The early phases of the research study make sure the treatment is safe. The later phases of the study show if it works better than the treatment used now.
Phases of Clinical Trials
Number of People Who Take Part in Each Phase
|Phase I – Is the treatment safe?
||Often 20 – 80|
|Phase II – Does the treatment work?
||Often 100 - 300
|Phase III – Is the new treatment better than the standard treatment?
||Often 1,000 - 3,000|
|Phase IV – What is the long-term impact of the new treatment?
||Often several hundred to several thousand|
Who sponsors or provides funds for clinical trials?
They can be sponsored or funded by:
- Medical or health institutions
- Pharmaceutical companies
- Voluntary groups
- Federal agencies, such as the National Institutes of Health, or NIH for short
How is my safety protected if I join a clinical trial?
In the United States, there are strict guidelines to make sure that people who agree to be in a clinical trial are treated as safely as possible. These guidelines apply to all medical research involving human participants. The guidelines require the following:
- An institutional review board, also called an IRB, must review and approve every clinical trial plan. Every place doing a clinical trial must have an IRB. This review helps make sure that the risks of the study are small and are worth the possible benefits.
- Informed consent must be given by a patient before being in the study. Informed consent can be confusing. It means that you agree (consent) to be in the study and you understand all the facts about the being in the study, including any possible harm it may cause you.
What is an Institution Review Board (IRB)?
An institutional review board, also called an IRB, is a committee that makes sure a clinical trial is safe for patients in the study. Each medical center, hospital, or research facility doing clinical trials must have an active IRB.
Each IRB includes a diverse group doctors, faculty, staff and students at a specific institution. An IRB must also have at least one person from the community who is not connected to the institution. This board goes over each study plan and makes sure that the highest standards are met to protect the rights of the study participants.
What is Informed Consent?
Informed consent for a clinical trial is much more than just reading and signing a piece of paper. It involves two essential parts:
- An informed consent document
- A process that includes many conversations with the medical team doing the clinical trial
The informed consent document reviews all the information about the clinical trial. This document includes:
- The purposes of the research study
- How long the study will last
- The tests and treatments you will get
- The possible risks
- The potential benefits of being in the study
- Your rights as a participant. For example, you have the right to leave the study at any time
If there is even a small risk of your getting injured by being part of the research study, the informed consent document must also include:
- Who to contact if you are injured by being in the study
- A list of health treatments to treat an injury and how to get more information about these treatments
- Whether or not you are able to get any money (compensation) if you are injured and how this money can be obtained
Reading the informed consent document begins the informed consent process. This process includes a series of conversations between you and the research team. During these conversations the study researchers may also explain:
- Other treatments, if any, that you might use instead of the treatment being used in the study (This allows you to know all your treatment options before joining the research study.)
- How your records identifying you will be kept private
- Who can answer your questions about the research
Informed consent continues after you are in a clinical trial. It includes ongoing talks with the doctors and nurses doing the clinical trial. These conversations will help you make good decisions about whether to stay in the trial. Before, during, and even after the trial, you can ask questions and raise concerns. So informed consent is an ongoing and interactive process. It is not just a one-time information session or a form you read and sign.
How do I decide whether or not to participate?
You will want to look at all the pros and cons of any research study before choosing to be part of the study. Take the time to talk about the risks and benefits with others. Talk to your doctors and family to decide if being in the study is right for you.
Take this information with you when you talk with the research team. Use the questions below as you decide.
Questions to ask about a clinical trial
About the study:
- What is the purpose and phase of this study?
- Who is going to be in this study?
- Why do researchers believe the new treatment being tested may be effective? Has it been tested before, and if so, what were the findings?
- Who is sponsoring this study?
- Who has reviewed and approved the study?
- How long will the study last?
- Who will be in charge of my care during the study?
- Will I have to travel to be part of this study? If so, who will pay for travel?
About tests or treatments in the study:
- What kinds of tests and treatments are involved?
- What tests will I get as part of this study?
- Will I have to pay for any treatment or test?
- How do the possible drawbacks and benefits compare with those of my current treatment?
- What are the known short-term and long-term side effects of the treatment?
- How might being in this study affect my daily life?
- Will I need to go into the hospital to get the treatment or drug? If so, how often and for how long?
- How will I know that the treatment is working? Will results of the study be shared with me?
- If the treatment being studied is found to be harmful or not working, will I stop taking it?
After the study is over:
- Will I be able to still get this treatment after the study ends?
- What type of long-term follow-up care is part of this study?
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