CLINICAL TRIALS: HOW THEY WORK, AND WHO CAN PARTICIPATE
by Ayesha Bhargava Basic KnowledgeClinical trials are
research investigations that involve people like you and me. They are research
studies which involve testing novel medical interventions, strategies, devices
or treatment on volunteers in a bid to detect, manage, treat or prevent several
medical conditions and diseases.1 It could involve studying the
response of the volunteers to the novel intervention and observing for side
effects. The aim of which is to determine the safety and efficacy of the
intervention, and compare its effectiveness to other available interventions.
Clinical trials can also
be carried out to test new methods of using or combining available
interventions, and likewise to study how other factors like pharmacogenetics, dietary
changes, etc. can affect the overall outcome of drug therapy. In general,
clinical trials increase medical knowledge and aid the decision-making process in health care
by providing reliable data.2
How Do Clinical Trials Work?
In a bid to ensure the safety of the participants3,
the first phase of clinical trials involves the administration of a low dose of
the drug to a small group of people. This is to ascertain that the
new intervention does not produce any unwanted side effects in humans.
Clinical research
involving humans take place in the final stages of a lengthy, comprehensive and
systematic research process, and follow stringent standards and guidelines. At ClinicalMatch, these standards and guidelines 4
are sternly adhered to, with the aim of:
·
Protecting the participants
·
Providing accurate and reliable results
The research process
commences in a laboratory, which is where novel ideas and interventions are
tested. After animal studies, experimental interventions that are most
promising are moved to the clinical trials stage, where they would be tested in
human subjects. The new intervention is usually compared against the control,
which can be a placebo or an already
established intervention.
There are a number of
aspects involved in the planning, running and follow up of a clinical trial.
The Clinical Trial Protocol
Clinical trials follow a protocol, which is a plan
that explains the objectives, design, procedures, scientific background and
relevant statistical information of the study. The trial protocol describes:
·
The number of people that would
participate in the trial
·
Those that are eligible
·
The tests or procedures involved
·
The type of data to be collected
·
Details about the treatment plan
The Experimental and Control Groups
The efficacy of a novel
intervention is determined by comparing it to an established intervention,
placebo or other standard care which could be non-interventional. In a clinical
trial, the participants are segmented into two groups:
·
The experimental group, and
·
The control group
The experimental group is the
group that would be given the novel intervention, which is being accessed. In
contrast, the control group is the group
that would be given established intervention, placebo or other standard care.
On comparison, the difference in the results obtained from the two groups must
be sufficient to prove that such a distinction did not occur by chance.
A new intervention can be
compared with an established intervention in other to determine which of them
works better. A new intervention can also be compared with a placebo to
determine if such an intervention is effective.
Number of Participants Involved in a Clinical Trial
The effect of an
intervention may vary between different populations. Thus, to ensure that these
differences are real and did not occur by chance, promising interventions are
tested on a large number of people, and the results are statistically analyzed.
On a general note, the number of people that participate in a clinical trial
depends on the phase of the trial.
Avoiding Bias in a Clinical Trial
In clinical trials, the
researchers must take measures to ensure that Bias is avoided. Such
measures include randomization and blinding.5 Bias can affect the
results of a trial, causing the results to be unreliable. Randomization is most
times, done by a computer. It ensures that the differences observed between
comparison groups i.e. the experimental and control groups, are not due to the
participant’s pre-existing differences. Blinding also referred to as masking, helps
avoid Bias by ensuring that the participants, and in some cases, the
researchers are not informed about those that are receiving the novel
intervention and those that are not.
Who Can Participate in a Clinical Trial?
There are different types
of clinical trials and based on this fact; basically, anyone can participate in
clinical trials.
Types of Clinical Trials
According to Wikipedia6,
clinical trials can be classified based on the research objective or based on
their purpose. Based on the research objective, we have two types:
·
Observational Study
·
Interventional Study
While based on their
purpose, there are:
·
Screening Trials
·
Prevention Trials
·
Diagnostic Trials
·
Treatment Trials
·
Quality of Life Trials
·
Adaptive Trials
·
Epidemiological Trials, etc.
Inclusion and Exclusion Criteria in Clinical Trials
Due to the variety of
clinical trial types, almost anyone can participate. However, for all clinical
trials, there are guidelines as to who can participate.7 These
guidelines are referred to as inclusion and exclusion criteria8.
These criteria are determined by the type of clinical trial and are based on
factors like age, gender, previous medical history, type and stage of a disease
condition, amongst others.
Inclusion criteria refer
to the characteristics the prospective subject must possess to be allowed to
participate in the trial. The eligibility criteria are defined in the clinical
trial protocol and determine those who can be a part of the clinical trial.9
While some trials require healthy volunteers, some others require patient
volunteers. There are also clinical trials that require healthy and patient
volunteers. Typical examples of inclusion criteria include:
·
Having a particular type and stage of
illness
·
Being perfectly healthy, with the absence
of any medical conditions
Exclusion criteria, on
the other hand, are characteristics that rule out or disqualify prospective
subjects from being part of a clinical trial. Possible exclusion criteria
include:
·
Inability to give informed consent
·
Potential allergy to the intervention
·
If the participant is receiving another
treatment that might affect the result of the trial.
The inclusion and
exclusion criteria for a clinical trial are intended to ensure the safety of
the participants, justify the appropriateness of the subjects, minimize
volunteer withdrawals during the trial and ensure the overall success of the clinical
trial.
Rest assured, ClinicalMatch helps you find the perfect
clinical trials to participate in, and the right treatment regardless of the
condition.
REFERENCES
1.
What is a Clinical Trial, adapted from https://www.australianclinicaltrials.gov.au/what-clinical-trial
2.
How do Clinical Trials Work and Who can
Participate, adapted from https://www.medicalnewstoday.com/articles/278779
3.
Is it Safe to Participate in a
Clinical Trial, adapted from https://clinicalmatch.com/resource/articles/is-it-safe-to-participate-in-a-clinical-trial
4.
Clinical Trials and Human Subjects,
adapted from https://www.fda.gov/science-research/clinical-trials-and-human-subject-protection/regulations-good-clinical-practice-and-clinical-trials
5.
Statistics in clinical trials: Bias,
adapted from https://www.eupati.eu/clinical-development-and-trials/statistics-clinical-trials-bias/
6.
https://en.wikipedia.org/wiki/Clinical_trial#Types
7.
Who can be part of clinical trial, adapted
from https://www.australianclinicaltrials.gov.au/what-clinical-trial/who-can-be-part-clinical-trial
8.
https://en.wikipedia.org/wiki/Inclusion_and_exclusion_criteria
9.
Clinical Trials, adapted fromhttps://www.nhlbi.nih.gov/health-topics/clinical-trials
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Created on Apr 13th 2020 05:03. Viewed 356 times.