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Clinical Trials Resource Center

Clinical Trial Frequently Asked Questions

The following frequently asked questions are important in understanding the unique process of clinical trials. If you have any questions or concerns about your rights as a research subject, call the Committee for the Protection of Human Subjects at (713) 500-7943. You may also call the Committee if you wish to discuss problems, concerns, and questions; obtain information about the research; and offer input about current or past participation in a research study.

Introduction to Clinical Trials

  • What are clinical trials

    A clinical trial is a research study to answer specific questions about vaccines, new therapies or new ways of using known treatments. Clinical trials (also called medical research and research studies) are used to determine whether new drugs or treatments are both safe and effective. Carefully conducted clinical trials are the fastest and safest way to find treatments that work in people.

  • Why are clinical trials important

    To advance the health of all people, researchers need volunteers to test the safety and efficacy of different medications and procedures. Clinical trials or studies aim to answer specific questions about new treatments or new theories that can be observed in a controlled environment.  Most of the medical breakthroughs and advancements that we enjoy today began as clinical studies with volunteer subjects.

  • Why participate in clinical trials

    Participants in clinical trials can play a more active role in their own health care, gain access to new research treatments before they are widely available, and help others by contributing to medical research.

  • Where do the ideas for trials come from

    Ideas for clinical trials usually come from researchers. After researchers test new therapies or procedures in the laboratory and in animal studies, the treatments with the most promising laboratory results are moved into clinical trials. During a trial, more and more information is gained about a new treatment, its risks and how well it may or may not work.

  • Who are members of the clinical teams

    The main team members are:

    • the Principal Investigator (PI) who is usually a physician and who is responsible for the design of the clinical trial and how it is conducted
    • the Research Nurse or Coordinator who coordinates the patient care while you are part of the study
    • sometimes Research Associates who work with the physician-scientist and the research nurse to assist in data collection and scheduling and who are part of the development of the clinical trial.
  • Who sponsors clinical trials

    Clinical trials are sponsored or funded by a variety of organizations or individuals such as physicians, medical institutions, foundations, voluntary groups, and pharmaceutical companies, in addition to federal agencies such as the National Institutes of Health (NIH), the Department of Defense (DOD), and the Department of Veteran's Affairs (VA). Trials can take place in a variety of locations, such as hospitals, universities, doctors' offices, or community clinics.

  • What is a protocol

    A protocol is a study plan on which all clinical trials are based. The plan is carefully designed to safeguard the health of the participants as well as answer specific research questions. A protocol describes what types of people may participate in the trial; the schedule of tests, procedures, medications, and dosages; and the length of the study. While in a clinical trial, participants following a protocol are seen regularly by the research staff to monitor their health and to determine the safety and effectiveness of their treatment.

  • What is a control or control group

    A control is the standard by which experimental observations are evaluated. In many clinical trials, one group of patients will be given an experimental drug or treatment, while the control group is given either a standard treatment for the illness or a placebo.

  • What are the different types of clinical trials

    Treatment trials test new treatments, new combinations of drugs, or new approaches to surgery or radiation therapy.

    Prevention trials look for better ways to prevent disease in people who have never had the disease or to prevent a disease from returning. These approaches may include medicines, vitamins, vaccines, minerals, or lifestyle changes.

    Screening trials test the best way to detect certain diseases or health conditions.

    Quality of Life trials (or Supportive Care trials) explore ways to improve comfort and the quality of life for individuals with a chronic illness.

  • What are the phases of clinical trials

    Clinical trials are conducted in phases. The trials at each phase have a different purpose and help scientists answer different questions:

    In Phase I trials, researchers test a new drug or treatment in a small group of people (20-80) for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.

    In Phase II trials, the study drug or treatment is given to a larger group of people (100-300) to see if it is effective and to further evaluate its safety.

    In Phase III trials, the study drug or treatment is given to large groups of people (1,000-3,000) to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.

    In Phase IV trials, post marketing studies delineate additional information including the drug's risks, benefits, and optimal use.

Participation in a Clinical Trial FAQ's

  • Who can participate in a clinical trial

    All clinical trials have guidelines about who can participate. Using inclusion/exclusion criteria is an important principle of medical research that helps to produce reliable results. The factors that allow someone to participate in a clinical trial are called "inclusion criteria" and those that disallow someone from participating are called "exclusion criteria". These criteria are based on such factors as age, gender, the type and stage of a disease, previous treatment history, and other medical conditions. Before joining a clinical trial, a participant must qualify for the study. Some research studies seek participants with illnesses or conditions to be studied in the clinical trial, while others need healthy participants. It is important to note that inclusion and exclusion criteria are not used to reject people personally. Instead, the criteria are used to identify appropriate participants and keep them safe. The criteria help ensure that researchers will be able to answer the questions they plan to study.

  • How to participate in a clinical trial

    All clinical trials have study coordinators, individuals who manage the daily operation of a clinical trial. This includes contacting participants and keeping track of the data. If you wish to participate in a clinical trial, you would use the contact information attached to the particular study in which you are interested. The study coordinator will then direct you to the next step in the process.

  • What happens during a clinical trial

    The clinical trial process depends on the kind of trial being conducted. The clinical trial team includes doctors and nurses as well as social workers and other health care professionals. They check the health of the participant at the beginning of the trial, give specific instructions for participating in the trial, monitor the participant carefully during the trial, and stay in touch after the trial is completed.
    Some clinical trials involve more tests and doctor visits than the participant would normally have for an illness or condition. For all types of trials, the participant works with a research team. Clinical trial participation is most successful when the protocol is carefully followed and there is frequent contact with the research staff.

  • What is informed consent

    Informed consent is the process of learning the key facts about a clinical trial before deciding whether or not to participate. It is also a continuing process throughout the study to provide information for participants. To help someone decide whether or not to participate, the doctors and nurses involved in the trial explain the details of the study. If the participant's native language is not English, translation assistance can be provided. Then the research team provides an informed consent document that includes details about the study, such as its purpose, duration, required procedures, and key contacts. Risks and potential benefits are explained in the informed consent document. The participant then decides whether or not to sign the document. Informed consent is not a contract, and the participant may withdraw from the trial at any time.

  • What kind of preparation should a potential participant make for the meeting with the research coordinator or doctor
    • Plan ahead and write down possible questions to ask.
    • Ask a friend or relative to come along for support and to hear the responses to the questions.
    • Bring a tape recorder to record the discussion to replay later.
  • What should people consider before participating in a trial

    People should know as much as possible about the clinical trial and feel comfortable asking the members of the health care team questions about it, the care expected while in a trial, and the cost of the trial. The following questions might be helpful for the participant to discuss with the health care team. Some of the answers to these questions are found in the informed consent document.

    • What is the purpose of the study?
    • Who is going to be in the study?
    • Why do researchers believe the new treatment being tested may be effective? Has it been tested before?
    • What kinds of tests and treatments are involved?
    • How do the possible risks, side effects, and benefits in the study compare with my current treatment?
    • How might this trial affect my daily life?
    • How long will the trial last?
    • Will hospitalization be required?
    • Who will pay for the treatment?
    • Will I be reimbursed for other expenses?
    • What type of long-term follow-up care is part of this study?
    • How will I know that the treatment is working? Will results of the trials be provided to me?
    • Who will be in charge of my care?
  • Does a participant continue to work with a primary health care provider while in a trial

    Yes. Most clinical trials provide short-term treatments related to a designated illness or condition, but do not provide extended or complete primary health care. In addition, by having the health care provider work with the research team, the participant can ensure that other medications or treatments will not conflict with the protocol. 

  • What are side effects and adverse reactions

    Side effects are any undesired actions or effects of drug or treatment. Negative or adverse effects may include headache, nausea, hair loss, skin irritation, or other physical problems. Experimental treatments must be evaluated for both immediate and long-term side effects.

  • What are the benefits and risks of participating in a clinical trial

    Clinical trials that are well-designed and well-executed are the best treatment approach for eligible participants to:


    • Play an active role in their own health care. Gain access to new research treatments before the treatments are widely available.
    • Obtain expert medical care at leading health care facilities during the trial.
    • Help others by contributing to medical research.

    There are risks to participating in a clinical trial:


    • There may be unpleasant, serious or even life-threatening side effects to treatment.
    • The treatment may not be effective for the participant.
    • The protocol may require more of the participant’s time and attention than would a non-protocol treatment, including trips to the study site, more treatments, hospital stays or complex dosage requirements.
  • How is the safety of the participant protected

    The ethical and legal codes that govern medical practice also apply to clinical trials. In addition, most clinical research is federally regulated with built in safeguards to protect the participants. The trial follows a carefully controlled protocol, a study plan which details what researchers will do in the study. As a clinical trial progresses, researchers report the results of the trial at scientific meetings, to medical journals, and to various government agencies. Individual participants' names will remain secret and will not be mentioned in these reports.

    Every clinical trial in the U.S. must be approved and monitored by an Institutional Review Board (IRB) to make sure the risks are as low as possible and are worth any potential benefits. An IRB is an independent committee of physicians, statisticians, community advocates, and others that ensures that a clinical trial is ethical and the rights of study participants are protected. All institutions that conduct or support biomedical research involving people must, by federal regulation, have an IRB that initially approves and periodically reviews the research.

  • Can a participant leave a clinical trial after it has begun

    Yes. A participant can leave a clinical trial, at any time. When withdrawing from the trial, the participant should let the research team know about it, and the reasons for leaving the study.



Center for Clinical and Translational Sciences

Clinical Trials Resource Center (CTRC)
7000 Fannin Street, Suite 795

Houston, Texas 77030
phone 713-500-3622
fax 713-500-0334