What are the phases of clinical research trials?
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Johns Hopkins Medicine answered:Clinical trials include research at four different phases. Each phase answers different questions about what’s being studied. The phases for clinical trial testing for a new treatment are:
•Phase I - This is the first step in testing a new treatment in humans. In these studies, researchers look for the best way to give an experimental drug (e.g., by mouth, IV drip, or injection; how many times a day). They also try to find out if and how the treatment can be given safely (e.g., best dose), and they watch for any harmful side effects. Because less is known about the possible risks and benefits in Phase I, these studies usually include only a limited number of patients who would not be helped by other known treatments.
•Phase II - These trials focus on learning whether the experimental drug have a disease-fighting effect (e.g., Does it shrink a tumor? Improve blood test results?). As in Phase I, only a small number of people take part because of the risks and unknown variables involved.
•Phase III - This phase of testing compares the results of people taking the experimental drug with the results of people taking standard treatment (e.g., Which group has better survival rates? Fewer side effects?). In most cases, studies move into Phase III testing only after a drug shows promise in Phases I and II. Phase III trials may include hundreds of people around the country. Comparing similar groups of people taking different treatments for the same type of disease is another way to make sure that study results are real and caused by the treatment, rather than by chance, or other factors. Comparing treatments with each other often shows clearly which one is more effective and/or has fewer side effects.
•Phase IV trials include the continuing evaluation that takes place after FDA approval, when the therapy is already available for general use.Clinical trials include research at four different phases. Each phase answers different questions about what’s being studied. The phases for clinical trial testing for a new treatment are: •Phase I - This is the first step in... More -
Phase I Trials: Researchers test a new drug or treatment in a small group of people (10-50) for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
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.
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.
Phase IV Trials: Post-marketing studies delineate additional information including the drug's risks, benefits, and optimal use.
Phase I Trials: Researchers test a new drug or treatment in a small group of people (10-50) for the first time to evaluate its safety, determine a safe dosage range, and identify side effects. Phase II Trials: The study drug or treatment is... More -
Piedmont Heart Institute answered:Clinical trials are a kind of clinical research designed to evaluate and test new interventions such as psychotherapy or medications. Clinical trials are often conducted in four phases. The trials at each phase have a different purpose and help scientists answer different questions.
Phase I trials: Researchers test an experimental drug or treatment in a small group of people for the first time. The researchers evaluate the treatment's safety, determine a safe dosage range, and identify side effects.
Phase II trials: The experimental drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase III trials: The experimental study drug or treatment is given to large groups of people. Researchers confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the experimental drug or treatment to be used safely.
Phase IV trials: Post-marketing studies, which are conducted after a treatment is approved for use by the FDA, provide additional information including the treatment or drug's risks, benefits, and best use.
This answer is based on source information from National Institute of Mental Health.
Clinical trials are a kind of clinical research designed to evaluate and test new interventions such as psychotherapy or medications. Clinical trials are often conducted in four phases. The trials at each phase have a different purpose and help... More -
Dr. Marc Garnick answered:Doctors often suggest that patients take part in clinical trials to gain access to promising treatments and medications. Trials are grouped into four phases:
- Phase I trials involve a small number of people and help assess the safety of a new treatment or determine an effective drug dose.
- Phase II trials focus on the effectiveness of a treatment and usually involve fewer than 100 participants.
- Phase III trials compare a new treatment with standard treatments. This can involve adding a new drug to a proven therapy to determine if the combination is more effective. The size of these trials ranges from hundreds to thousands of participants.
- Phase IV trials gather information about treatments that have already been approved by the Food and Drug Administration (FDA) for use in patients.
Doctors often suggest that patients take part in clinical trials to gain access to promising treatments and medications. Trials are grouped into four phases: Phase I trials involve a small number of people and help assess the safety of a new... More
