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Clinical trials are part of clinical research and at the heart of all medical advances. 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. Clinical trials can also look at other aspects of care, such as improving the quality of life for people with chronic illnesses.
People participate in clinical trials for a variety of reasons. Healthy volunteers say they participate to help others and to contribute to moving science forward. Participants with an illness or disease also participate to help others, but also to possibly receive the newest treatment and to have the additional care and attention from the clinical trial staff. Clinical trials offer hope for many people and an opportunity to help researchers find better treatments for others in the future.
Clinical research is medical research that involves people like you. People volunteer to participate in carefully conducted investigations that ultimately uncover better ways to treat, prevent, diagnose, and understand human disease. Clinical research includes trials that test new treatments and therapies as well as long-term natural history studies, which provide valuable information about how disease and health progress.
The idea for a clinical research study — also known as a clinical trial — often originates in the laboratory. After researchers test new therapies or procedures in the laboratory and in animal studies, the most promising experimental treatments are moved into clinical trials, which are conducted in phases. During a trial, more information is gained about an experimental treatment, its risks, and its effectiveness.
Clinical research is conducted per a plan known as a protocol. The protocol is carefully designed to safeguard the participants’ health and answer specific research questions. A protocol describes the following:
- Who is eligible to participate in the trial
- Details about tests, procedures, medications, and dosages
- The length of the study and what information will be gathered
A clinical study is led by a principal investigator (PI), who is often a doctor. Members of the research team regularly monitor the participants’ health to determine the study’s safety and effectiveness.
Most, but not all, clinical trials in the United States are approved and monitored by an Institutional Review Board (IRB) to ensure that the risks are minimal and are worth any potential benefits. An IRB is an independent committee that consists of physicians, statisticians, and members of the community who ensure that clinical trials are ethical and that the rights of participants are protected. Potential research participants should ask the sponsor or research coordinator whether the research they are considering participating in was reviewed by an IRB.
Clinical trials are sponsored or funded by various organizations or individuals, including physicians, foundations, medical institutions, voluntary groups, and pharmaceutical companies, as well as federal agencies such as the National Institutes of Health and the Department of Veterans Affairs.
Informed consent is the process of providing potential participants with the key facts about a clinical trial before they decide whether to participate. The process of informed consent (providing additional information) continues throughout the study. To help someone decide whether or not to participate, members of the research team explain the details of the study. Translation or interpretive assistance can be provided for participants with limited English proficiency. The research team provides an informed consent document that includes details about the study, such as its purpose, duration, required procedures, and who to contact for further information. The informed consent document also explains risks and potential benefits. The participant then decides whether to sign the document. Informed consent is not a contract. Volunteers are free to withdraw from the study completely or to refuse particular treatments or tests at any time. Sometimes, however, this will make them ineligible to continue the study.
There are different types of clinical trials.
- Natural history studies provide valuable information about how disease and health progress.
- Prevention trials look for better ways to prevent a disease in people who have never had the disease or to prevent the disease from returning. Better approaches may include medicines, vaccines, or lifestyle changes, among other things.
- Screening trials test the best way to detect certain diseases or health conditions.
- Diagnostic trials determine better tests or procedures for diagnosing a particular disease or condition.
- Treatment trials test new treatments, new combinations of drugs, or new approaches to surgery or radiation therapy.
- Quality of life trials (or supportive care trials) explore and measure ways to improve the comfort and quality of life of people with a chronic illness.
Clinical trials are conducted in “phases.” Each phase has a different purpose and helps researchers answer different questions.
- Phase I trials: Researchers test an experimental drug or treatment in a small group of people (20–80) for the first time. The purpose is to evaluate its safety and identify side effects.
- Phase II trials: The experimental drug or treatment is administered to a larger group of people (100–300) to determine its effectiveness and to further evaluate its safety.
- Phase III trials: The experimental drug or treatment is administered to large groups of people (1,000–3,000) to confirm its effectiveness, monitor side effects, compare it with standard or equivalent treatments, and collect information that will allow the experimental drug or treatment to be used safely.
- Phase IV trials: After a drug is approved by the FDA and made available to the public, researchers track its safety, seeking more information about a drug or treatment’s risks, benefits, and optimal use.
Some Concepts to Understand
Typically, clinical trials compare a new product or therapy with another that already exists to determine if the new one is as successful as, or better than, the existing one. In some studies, participants may be assigned to receive a placebo (an inactive product that resembles the test product, but without its treatment value).
Comparing a new product with a placebo can be the fastest and most reliable way to demonstrate the new product’s therapeutic effectiveness. However, placebos are not used if a patient would be put at risk — particularly in the study of treatments for serious illnesses — by not having effective therapy. Most of these studies compare new products with an approved therapy. Potential participants are told if placebos will be used in the study before they enter a trial.
Randomization is the process by which two or more alternative treatments are assigned to volunteers by chance rather than by choice. This is done to avoid any bias with investigators assigning volunteers to one group or another. The results of each treatment are compared at specific points during a trial, which may last for years. When one treatment is found superior, the trial is stopped so that the fewest volunteers receive the less beneficial treatment.
In single-or double-blind studies, also called single- or double-masked studies, the participants do not know which medicine is being used, so they can describe what happens without bias. "Blind" (or "masked") studies are designed to prevent members of the research team or study participants from influencing the results. This allows scientifically accurate conclusions. In single-blind ("single-masked") studies, only the patient is not told what is being administered. In a double-blind study, only the pharmacist knows; members of the research team are not told which patients are getting which medication so that their observations will not be biased. If medically necessary, however, it is always possible to find out what the patient is taking.
Many different types of people participate in clinical trials. Some are healthy, while others may have illnesses. A healthy volunteer is a person with no known significant health problems who participates in clinical research to test a new drug, device, or intervention. Research procedures with healthy volunteers are designed to develop new knowledge, not to provide direct benefit to study participants. Healthy volunteers have always played an important role in research.
Healthy volunteers are needed for several reasons. When developing a new technique, such as a blood test or imaging device, healthy volunteers (formerly called "normal volunteers") help define the limits of "normal." These volunteers serve as controls for patient groups and are often matched to patients on characteristics such as age, gender, or family relationship. They receive the same test, procedure, or drug the patient group receives. Investigators learn about the disease process by comparing the patient group to the healthy volunteers.
Factors like how much of your time is needed, the discomfort you may feel, or risk involved depends on the trial. While some require minimal amounts of time and effort, other studies may require a major commitment of time and effort on behalf of the volunteer and may involve some discomfort. The research procedure may also carry some risk. The consent process for healthy volunteers includes a detailed discussion of the study's procedures and tests.
A patient volunteer has a known health problem and participates in research to better understand, diagnose, treat, or cure that disease or condition. Research procedures with a patient volunteer help develop new knowledge. These procedures may or may not benefit the study participants.
Patient volunteers may be involved in studies similar to those in which healthy volunteers participate. These studies involve drugs, devices, or interventions designed to prevent, treat, or cure disease. Although these studies may provide direct benefit to patient volunteers, the main aim is to prove, by scientific means, the effects and limitations of the experimental treatment. Consequently, some patients serve as controls by not taking the test drug, or by receiving test doses of the drug large enough only to show that it is present, but not at a level that can treat the condition. A study's benefits may be indirect for the volunteers but may help others.
All clinical trials have guidelines about who can participate, called Inclusion/Exclusion Criteria. Factors that allow someone to participate in a clinical trial are "inclusion criteria." Those that exclude or not allow participation are "exclusion criteria." These criteria are based on factors such 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 volunteers.
Some studies need both types. Inclusion and exclusion criteria are not used to reject people personally; rather, the criteria are used to identify appropriate participants and keep them safe and to help ensure that researchers can find the new information they need.
Risks and Benefits
Clinical trials involve risks, just as routine medical care and the activities of daily living. When weighing the risks of research, you can consider two important factors:
- the degree of harm that could result from participating in the study, and
- the chance of any harm occurring.
Most clinical studies pose the risk of minor discomfort, which lasts only a short time. However, some study participants experience complications that require medical attention. In rare cases, participants have been seriously injured or have died of complications resulting from their participation in trials of experimental therapies. The specific risks associated with a research protocol are described in detail in the informed consent document, which participants are asked to sign before participating in research. Also, a member of the research team explains the major risks of participating in a study and will answer any questions you have about the study. Before deciding to participate, carefully consider possible risks and benefits.
Well-designed and well-executed clinical trials provide the best approach for participants to:
- Play an active role in their health care.
- Gain access to new research treatments before they are widely available.
- Receive regular and careful medical attention from a research team that includes doctors and other health professionals.
- Help others by contributing to medical research.
Risks to participating in clinical trials include the following:
- There may be unpleasant, serious, or even life-threatening side effects to experimental treatment.
- The study may require more time and attention than standard treatment would, including visits to the study site, more blood tests, more treatments, hospital stays, or complex dosage requirements.
If you are offered a clinical trial, feel free to ask any questions or bring up any issues concerning the trial at any time. The following suggestions may give you some ideas as you think about your own questions.
- What is the purpose of the study?
- Why do researchers think the approach may be effective?
- Who will fund the study?
- Who has reviewed and approved the study?
- How are study results and safety of participants being checked?
- How long will the study last?
- What will my responsibilities be if I participate?
Possible Risks and Benefits
- What are my possible short-term benefits?
- What are my possible long-term benefits?
- What are my short-term risks, such as side effects?
- What are my possible long-term risks?
- What other options do people with my disease have?
- How do the possible risks and benefits of this trial compare with those options?
Participation and Care
- What kinds of therapies, procedures and /or tests will I have during the trial?
- Will they hurt, and if so, for how long?
- How do the tests in the study compare with those I would have outside of the trial?
- Will I be able to take my regular medications while in the clinical trial?
- Where will I have my medical care?
- Who will be in charge of my care?
- How could being in this study affect my daily life?
- Can I talk to other people in the study?
- Will I have to pay for any part of the trial such as tests or the study drug?
- If so, what will the charges likely be?
- What is my health insurance likely to cover?
- Who can help answer any questions from my insurance company or health plan?
- Will there be any travel or child care costs that I need to consider while I am in the trial?
Tips for Asking Your Doctor About Trials
- Consider taking a family member or friend along, for support and for help in asking questions or recording answers.
- Plan ahead what to ask — but don't hesitate to ask any new questions you think of while you're there.
- Write down your questions in advance, to make sure you remember to ask them all.
- Write down the answers, so that you can review them whenever you want.
- Ask about bringing a tape recorder to make a taped record of what's said (even if you write down answers).
After a clinical trial is completed, the researchers carefully examine information collected during the study before making decisions about the meaning of the findings and about further testing. After a phase I or II trial, the researchers decide whether to move on to the next phase or to stop testing the agent or intervention because it was unsafe or ineffective. When a phase III trial is completed, the researchers examine the data and decide whether the results have medical importance.
Results from clinical trials are often published in peer-reviewed scientific journals. Peer review is a process by which experts review the report before it is published to ensure that the analysis and conclusions are sound. If the results are particularly important, they may be featured in news media and discussed at scientific meetings and by patient advocacy groups before they are published. Once a new approach has been proven safe and effective in a clinical trial, it may become the standard of medical practice.
Ask the research team members if the study results have been or will be published. Published study results are also available by searching for the study's official name or Protocol ID number in the National Library of Medicine's PubMed® database.
Only through clinical research can we gain insights and answers about the safety and effectiveness of drugs and therapies. Groundbreaking scientific advances in the present and the past were possible only because of participation of volunteers, both healthy and those diagnosed with an illness, in clinical research. Clinical research requires complex and rigorous testing in collaboration with communities that are affected by the disease. As clinical research opens new doors to finding ways to diagnose, prevent, treat, or cure disease and disability, clinical trial participation of volunteers is essential to help us find the answers.
It depends upon the research trial. You can expect the first visit to be the longest. It can take up to two hours. Just like when you visit a new doctor, we need to gather information and perform baseline tests.
From that point, most of your research visits will be very streamlined. While there are some exceptions, most will take 30 minutes or less. Typically, research offices see fewer patients than a typical physician’s office, so you can expect to spend little time in the reception area, if any.
Research visits are far more stable and predictable than visits to any of your regular doctors. During the informed consent process, we will discuss the study visits involved, including the length of each visit in the study so you can plan in advance. Participants are typically well compensated.
Clinical research requires multiple layers of protection for each patient. First and foremost, research is never conducted to confirm a medical guess. In fact, no one in the United States is allowed to perform clinical research without FDA approval. The FDA only approves a proposed trial that provides a substantial body of evidence supporting why it should be conducted and proves the research will maximize patient safety.
Once a study earns FDA approval, it then requires third-party ethics board approval from a US-based institutional review board (IRB). These groups have ultimate ability to approve or deny a research trial. To ensure the ethics board is completely independent and focused on protecting the participant, no one with a vested interest in the research can sit on an IRB or vote on the ethics of the trial.
An additional third-party group called the Data Safety Monitoring Board oversees research data as it’s being collected. They have the ability to stop a trial at any point if data doesn’t support continuing.
Bottom line, if you enter research trial you are not a guinea pig. In fact, you are cherished as a medical hero. You are cared for and protected better than would ever happen in normal medical care.
It’s highly unlikely to experience drug-drug interactions in a research trial. In fact, because research trials are designed in part to eliminate medical risks, your odds of a drug-drug interaction in a research trial are actually lower than if you go to your doctor for a new prescription.
Drug-drug interactions are situations wherein one drug can increase, decrease, or change the effect of another drug. Even though many of these interactions are minor, we eliminate all drug classes that could interact in any way with a study drug used in a research trial. Our goal is to eliminate anything that could increase risk or muddy results.
Research trial rules are far stricter than those in normal medical care. If a patient is on a medication we believe could interact with a study drug, he or she is ineligible to take part in the research trial.
It’s very unlikely that a patient is hurt during a research trial. Nonetheless, it’s important for you to know that you’re protected in several ways. The industry-sponsored research trials conducted by IACT Health have reliable provisions to take care of you if you are injured. You can review the specifics in our Informed Consent Document.
IRB’s, Good Clinical Practice/The International Conference on Harmonization (GCP/ICH), and federal regulations jointly govern Informed Consent Documents. The agreement must contain eight specific elements, one of which informs you of your rights if you are injured by a research trial. No research can take place without your consent.
Before participating in research, every patient must read, understand, and agree to that specific trial by signing the Informed Consent Document.
If you have a question we haven’t covered, please contact us.
Your doctor cares about you. We want them to be part of the research team and decision-making process. With your permission, we contact your doctor(s) to obtain an accounting of your medical records to gain as much information about your health and medical history as needed. In return (again, with your permission), we share research records so your doctor(s) remains aware of the research trial and your results.
Most doctor(s) are pleased and honored to be included in a patient’s decision to take control of their health. They – and you – benefit from the added information, support, medical care, and medication that come with participation in an IACT Health research trial.
Your doctor can never abandon you and it’s rare for a physician to discharge a patient from their practice. While uncommon, typical reasons why a patient might be discharged from a practice includes noncompliance (such as violating a treatment plan or contract), being verbally or physically abusive, or not paying a bill. Short of those extenuating circumstances, you can expect to maintain a great doctor/patient relationship simply by keeping open and honest lines of communication.
There is more blood work in research trials than there is in normal medical care. And that’s a good thing. It allows us to closely track your overall health, the health of your liver and kidneys, and the health of your blood cells and electrolytes.
And it’s actually not much blood. On average, we have 77 mL of blood per kilogram of body weight. For example, with a 154-pound adult, we would draw approximately three 7 mL tubes of blood. That equates to about one-third of 1% of the blood in your body.
The next time you’re faced with blood work, remember you’re giving a very small amount to get a great amount of care.