What are clinical trials?
Clinical trials study potential new treatments in health volunteers and/or people with a specific illness or condition. These treatments already have had some positive effects on a disease in lab or animal experiments. Clinical trials are the next step in the drug development process to see if a treatment generally safe and effective in people.
It takes a lot of research to develop a new treatment
Different phases in clinical development
It takes a lot of research to develop a new treatment. Clinical trials are done in several steps, also called “phases”. Each phase has a specific purpose, such as to look at how well the treatment or drug works, what is the best dose and what side effects may occur.
Before clinical trials can be done with human participants, researchers study new treatments in the lab. This is called “pre-clinical development”. Once the researchers have enough information, they ask for permission to do clinical trials from the health authority and independent groups called ethics committees.
Frequently asked questions
- Why are clinical trials necessary at all?expand_more
Clinical trials play a key role when developing a new drug. Yet, despite being necessary, tests involving humans are often viewed critically. How do we ensure the highest ethical standards for clinical trials?
- What happens during a clinical trial?expand_more
During a clinical trial, the participants get treatments and tests according to a “protocol”. A protocol describes what will be done in the trial and how. Everything is planned very carefully to keep participants as safe as possible. Some trials compare a new treatment to a standard one that is already available. Other trials compare a treatment to a “placebo”. A placebo is designed to resemble the treatment but does not have any real effect. Some trials just look at a treatment without any comparisons.
- How long does a trial take?expand_more
It can take months or even years to do a clinical trial. And, a trial can go on for much longer than each participant is in it.
The length of a trial and the amount of time the participants are in it depends on how long it takes for researchers to collect all the information they need.
The length also depends on:- Which step in the research process the trial is in. The steps are called “phases”. Phase 1 and 2 trials are shorter than Phase 3 and 4 trials.
- The type of disease and treatment in the trial. Some treatments need to be studied over a long time to find out if they were safe and helped participants with certain disease. But other diseases and treatments can be studied in a short time.
- The number of participants needed in the trial. Some trials need to collect information from thousands of participants. These trials take longer to make sure the researchers get information from enough participants.
Once a trial is finished and all the participants have completed their part, the researchers review all the information that was collected. This can also take many months. If the sponsor seeks approval for the drug so it can be used in all patients, it can take months for the drug to be reviewed and approved by the governments health agency.
- Where do clinical trials take place?expand_more
Clinical trials take place in doctors’ offices, medical centers, community hospitals and clinics. They may be done in one place or in hundreds of places at the same time. Each location has a research team. The research team includes doctors, nurses, and other health care professionals. The research team collects information from the participants during the trial to study if the treatments are working and are safe.
- Who sponsors clinical trials?expand_more
Clinical trials can be sponsored by physicians, medical institutions, foundations, non-profit organizations, pharmaceutical companies, and government agencies. A sponsor oversees or pays for a clinical trial and collects and analyzes the data.
- What are requirements for joining a trial? Why are they important?expand_more
Requirements, also called “eligibility criteria”, can be about age, gender, the type and stage of a disease, previous treatment, and other medical conditions.
“Inclusion criteria” are the requirements a person must have to be in a trial. By allowing only certain participants in a trial, researchers can be sure the effects of the treatment are not influenced by other factors.
“Exclusion criteria” are requirements that might prevent a person from being in a trial. These criteria protect people who may be made worse if they were in a trial. - Why are children important for clinical trials?expand_more
Medically speaking, children are not just “little adults”: the composition of their bodies and maturity of their organs not only differ from those of adults quantitatively, a number of diseases only occur in children or progress differently in children than in adults. Children also need special protection because of their intellectual and emotional limitation to provide informed consent. Therefore, especially strict regulations and ethical standards have been developed for pediatric studies.
- Are animals studies really necessary?expand_more
Is animal testing really necessary? And how has it developed over the last years? This short video will anwers your questions.
- What is “informed consent”?expand_more
“Informed consent” is a process to make sure you understand important information about a clinical trial and agree to be in the trial. Information may include the purpose of the trial, the treatments used, and the potential risks and benefits. After you have a conversation with the clinical trial staff, all clinical trial participants must sign an informed consent form. Signing the form does not mean a participant must stay in the trial. Participants can leave a clinical trial at any time. The research staff will discuss with them what continued care they may need for their condition/disease and will continue to monitor them after they leave the study in case they have any delayed side effects. If new benefits, risks, or side effects are discovered during the trial, the researchers must tell the participants. Participants may need to sign a new informed consent form to stay in the trial.
- Why are drug trials on people carried out in developing countries?expand_more
We do clinical trials all around the world, as they need to be representative for the people intended to use a new medicine.
- How are participants protected?expand_more
Medical research done in people must follow strict rules. Every clinical trial has a plan called a “protocol”. The protocol is a set of instructions that everyone in the trial must follow. It is the plan for how the trial will be carried out.
The protocol describes what will be done in the trial and how. It also describes why each part of the trial is necessary.
Before it begins, a trial must be approved by a health authority and other organizations. Different countries require different approvals. Approvals ensure that trial participants will be treated well and that the study treatment is worth the risk. - Couldn’t clinical trials be done more cheaply?expand_more
- Is there an independent group that approves and oversees clinical trials?expand_more
Yes. Every clinical trial must be approved and overseen by an “Institutional Review Board”, also called an “IRB”. An IRB is an independent group that makes sure a clinical trial is safe enough to be worth any risk to participants. These group can also be called an “Independent Ethics Committee”, or an “IEC”. The group can include doctors, statisticians, community advocates, and others. They review and approve the trial plan, called a protocol, and the materials that might be given to the participants. They also make sure that the participants are treated well while they are in the trial.
- Can participants leave a clinical trial after it has begun?expand_more
Yes. A participant can leave a clinical trial at any time without giving a reason. The participant should tell the research team if they want to leave and it would be helpful if the participant told the team why he/she is leaving.
- Do participants still see their primary care doctor while in a clinical trial?expand_more
Yes. Participants should still see their primary care doctor. Most clinical trials only give treatment for one condition over a short time. They do not give other medical care like primary care doctors. Primary care doctors can work with the research team to make sure that a participant’s other medications and treatments will not conflict with the clinical trial protocol.
- Is a clinical trial the same as “standard of care”?expand_more
No. “Standard of care” is a treatment that has already been tested and approved by the health authority. Treatment in a clinical trial is still being tested.
When you go to your regular doctor, you get a standard of care. For example, you may get a cast if you break your arm. We know how a cast works for most people.
When you participate in a clinical trial, you get care that is still being studied. For example, you may get a new drug to see if it stops breast cancer from coming back. We don’t know how the new drug works. - Is there a plan that clinical trials have to follow?expand_more
Yes. Every clinical trial has a carefully designed plan called a “protocol”. The protocol describes what will be done in the trial and how. It may include the:
- Types of people that can participate in the trial
- Schedule of tests, procedures, medications, and dosages
- Length of the trial
The protocol is designed to protect the trial participants and answer specific research questions. Everyone in the trial follows the same protocol.
- What is a “placebo”?expand_more
A “placebo” is designed to resemble the treatment but does not have any real effect. In clinical trials, new treatments are often compared with placebos. Some participants are given a placebo instead of a treatment. This helps make sure that any effects are actually caused by the treatment being studied.
- What is a “control” or “control group”?expand_more
A “control” helps researchers compare a study treatment. In many clinical trials, one group of participants gets a study treatment and a “control group” of participants gets a standard treatment or a placebo. Researchers compare the results of both groups to see if a study treatment works better.
- What is “expanded access protocol”?expand_more
“Expanded access protocol” allows people to take a study drug even if they can’t participate in the clinical trial. These people may not be able to participate in the trial because of their age, other health problems, or other reasons. But the study drug may still help them. Makers of new drugs can give “expanded access” to patients if researchers are studying or have finished studying the drug in a clinical trial. There must be evidence that the drug can help these patients and is worth any risk.
- Who is part of the clinical trial team?expand_more
Clinical trials involve a lot of people who do different things. Each person plays an important role. The principal investigator, also called a PI, is responsible for organizing and leading the trial as well as recording and studying the data. The PI also directs the team. Like a team manager, the PI follows a playbook, which is called the study “protocol”. The protocol is a set of instructions that everyone in the game must follow. It’s the plan for how the study will be carried out. The research staff members are like assistant managers who help the PI. The clinical research coordinator handles the day-to-day activity at the research site. He or she has easy access to the PI and is the main contact for participants. If you have questions about the trial or your health, ask the clinical research coordinator.
- Do participants get paid to be in a clinical trial?expand_more
Some trials pay for the participants’ travel costs, time and commitment. Not all do. The amount paid varies.
- How should participants prepare for meeting with the research coordinator or doctor?expand_more
Participants should:
- Plan ahead and write down questions to ask.
- Ask a friend or relative to come along for support and to hear the responses to the questions.
- Bring an audio recorder to record the discussion to replay later.
- What should participants consider before participating in a clinical trial?expand_more
- Participating in a clinical trial takes time and commitment.
- The clinical trial could end at any time. Even if you want to continue to participate, the company making the drug could stop the trial.
- Clinical trial participants may not feel better.
- All trial participants should let their doctors know that they are participating in a trial.
- What are some benefits of taking part in a clinical trial?expand_more
- Participants may get access to a new drug that is not available to other people because it is not on the market yet.
- Study doctors and nurses will closely monitor your health during the clinical trial.
- Results of the clinical trial may help other people for their health problems in the future as it adds to medical knowledge about diseases.
- What are some risks of taking part in a clinical trial?expand_more
- The new treatment may not work for you.
- As any drug, a new treatment may have expected and unexpected side effects.
- In some trials, participants don’t know whether they receive the new treatment or are assigned to get placebo or standard therapy currently used instead.
- Depending on countries and health insurance systems, participants may need to cover some of the costs.
- Participants may need to visit the doctor more often than if they were not in a clinical trial.
- Are only trial results published that suit the pharma industry?expand_more
Do you know that we publish summary reports of our trials online to support transparency and foster scientific discoveries? We do this regardless of positive or negative outcomes.
Participate in a Bayer trial
Bayer clinical trials study a new treatment’s safety or how well it helps people with a disease/condition. The treatment may be a drug, medical device, or new way of using an existing treatment. You can volunteer to participate in a clinical trial.
Find a Bayer trial that might be right for you.