Key takeaways:
Clinical trials are an essential part of medical research, and there are thousands of studies underway worldwide.
Clinical trials often offer treatments that can benefit participants by providing free care and, sometimes, compensation for your time, but research also carries risks.
Several sources can help you find a clinical trial to join — either as a participant seeking treatment for a medical condition or as an eligible volunteer.
Clinical trials are critical aspects of scientific research. By involving human participants in medical studies, researchers are able to find out if new treatments are safe and effective. Clinical trials can test new drugs or drug combinations and new surgical procedures or devices, as well as new ways of making diagnoses or using existing treatments. Clinical trials play a crucial role in developing vaccines — including these for the virus that causes COVID-19.
Beyond strictly medical conditions, clinical trials also explore anti-aging treatments and other interventions that can improve quality of life.
There are many ways to find out about clinical trials. If you are being treated for a particular health condition, such as diabetes, you can ask your provider about current research studies. Condition-focused advocacy groups, such as the National Kidney Foundation, maintain specific condition-based lists of clinical trials. COVID-19 clinical trials remain ongoing. Other general sources include:
ClinicalTrials.gov: This searchable database includes more than 300,000 studies in every U.S. state and more than 200 countries. An advanced search option allows you to look for clinical trials by condition, location, and other factors.
National Institutes of Health (NIH): The NIH Clinical Center has a search tool for clinical research conducted at its campus in Bethesda, Maryland.
Centers for Disease Control and Prevention (CDC): The CDC maintains information about research studies and links to condition-based information, such as for epilepsy, and clinical trials conducted by the National Cancer Institute.
ResearchMatch: NIH funds ResearchMatch.org as a free resource to connect people to studies and researchers to willing participants. Start with the volunteer agreement to explore your options or sign up.
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Clinical trials usually involve a four-step research process, which often follows extensive preliminary work or sometimes testing on animals.
The phases involving humans are:
Phase I: An experimental drug, device, or treatment is evaluated in a small group of people to test safety, reveal side effects, and determine the correct dosage.
Phase II: The experimental drug, device, or treatment is given to a larger group to test effectiveness and safety.
Phase III: The number of people participating now is even larger. Researchers confirm effectiveness, monitor side effects, and make comparisons to commonly used treatments.
Phase IV: This “post-market” testing occurs after a drug, device, or treatment’s approval in a larger, more diverse population over a longer period of time.
Every study has its own guidelines for eligible participants. Some clinical trials seek people with a specific illness or condition, while others want healthy volunteers. Factors that allow you to qualify are called “inclusion criteria,” and “exclusion criteria” are factors that will disqualify you from participation.
Every clinical trial must have a protocol. These strict rules are designed to answer questions about the health and safety of participants and explain exactly what will happen to you. Your participation requires informed consent. If you decide to enroll in the clinical trial, you must sign the informed-consent document. You are free to leave the study at any time.
Some studies must be reviewed, approved, and monitored by an institutional review board, or IRB. They include clinical trials the federal government is conducting or supporting, and research involving a drug, biological product, or medical device regulated by the U.S. Food and Drug Administration (FDA). The IRB includes physicians, researchers, and community members who ensure the study is ethical and participants are protected. The IRB also reviews informed-consent documents.
If the federal government is conducting or supporting a clinical trial, or if the research involves a drug, biological product, or medical device regulated by the U.S. Food and Drug Administration (FDA), the study must be reviewed, approved, and monitored by an institutional review board, or IRB.
It’s important to note that clinical trials have risks. You may be at greater risk in a clinical trial that’s testing something new or in an earlier-phase trial where the study involves a small group of people.
According to the National Institutes of Health, the potential downsides of taking part in a clinical trial include:
Side effects or discomfort
Outcomes that are ineffective or no better than standard treatment
No experimental treatment at all, if you are part of the control group, which receives the standard treatment or placebo (with no therapeutic value). The treatment group receives the new drug, device, or intervention
Inconvenience for the time spent in medical appointments or if you must travel a great distance
Clinical trials are voluntary, so the first step is to express an interest in participation. Your provider may be able to connect you to a relevant clinical trial. On your own, ResearchMatch is a way to find a study for which you qualify.
Some clinical trials will compensate you for participation. Others reimburse your expenses related to the study. Often, paid studies will advertise. In the Clinicaltrials.gov advanced search, entering “paid” in the “other terms” query box can help you find studies that offer compensation.
There are times, such as during cancer treatment, that health insurance plans must cover routine healthcare costs during your clinical trial. Routine costs include doctor visits, diagnostic tests, and hospital stays.
Participating in a clinical trial may be able to help you find a treatment for an illness or health condition while advancing research. There are many resources available to help you find a clinical trial that may be right for you. You may even get paid for participating or reimbursed for study-related expenses. As with any medical care, there are potential risks. Ask questions, and know that you can leave a clinical trial for any reason at any time.
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CombatCOVID. (n.d.). COVID-19 clinical trials. U.S. Department of Health and Human Services.
Congress.gov. (2020). H.R.133 - Consolidated Appropriations Act, 2021.
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National Cancer Institute. (2020). Insurance coverage and clinical trials.
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National Institute on Aging. (2020). What are clinical trials and studies?
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Researchmatch.org. (n.d.). Volunteer agreement.
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U.S. Food and Drug Administration. (2019). Institutional Review Boards (IRBs) and protection of human subjects in clinical trials.
World Health Organization. (n.d.). Clinical trials.