Introduction
What Are Clinical Trials?
Clinical Trials Take Place in Phases
Clinical Trials Follow Strict Guidelines
Who Can Join a Clinical Trial?
Randomization
Patient Protection
Deciding to Take Part in Clinical Trials
Questions to Ask
How to Find Clinical Trials
Introduction
If you have cancer, you may want to think about
taking part in a clinical trial. Clinical trials are
a treatment option for many people with cancer.
This book explains cancer treatment clinical trials
and gives you some things to think about when
deciding whether to take part.
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What Are Clinical Trials?
Clinical trials are research studies that involve people. They
are the final step in a long process that begins with research
in a lab and animal testing. Many treatments used today are
the result of past clinical trials.
In cancer research, clinical trials are designed to answer
questions about new ways to:
- Treat cancer
- Find and diagnose cancer
- Prevent cancer
- Manage symptoms of cancer or its treatment
This booklet will focus on cancer treatment studies. These
studies are designed to answer questions about new
treatments or new ways of using an old treatment and how
well they work. These trials test many types of treatments,
such as new:
- Drugs or vaccines
- Ways to do surgery or give radiation therapy
- Combinations of treatments
Many treatments used today are the results
of past clinical trials.
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Clinical Trials Take Place in Phases
For a treatment to become part of standard treatment, it
must first go through 3 or 4 clinical trial phases. You do not
have to take part in all phases. The early phases make sure the
treatment is safe. Later phases show if it works better than
the standard treatment.
Purpose | Number of people
who take part |
Phase I |
To find a safe dose
To decide how the new treatment
should be given
To see how the new treatment
affects the human body | 15-30 people |
Phase II |
To determine if the new treatment
has an effect on a certain cancer
To see how the new treatment
affects the human body | Less than 100 people |
Phase III |
To compare the new treatment
(or new use of a treatment) with
the current standard treatment | From 100 to
thousands of people |
Phase IV |
To further assess the long-term
safety and effectiveness of a
new treatment | Several hundred to
several thousand
people |
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Clinical Trials Follow Strict Guidelines
The guidelines that clinical trials follow clearly state who will
be able to join the study and the treatment plan. Every trial
has a person in charge, usually a doctor, who is called the
principal investigator. The principal investigator prepares a
plan for the study, called a protocol, which is like a recipe for
conducting a clinical trial.
The protocol explains what the trial will do, how the study
will be carried out, and why each part of the study is
necessary. It includes information on:
- The reason for doing the study
- Who can join the study
- How many people are needed for the study
- Any drugs they will take, the dose, and how often
- What medical tests they will have and how often
- What information will be gathered about them
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Who Can Join a Clinical Trial?
Based on the questions the research is trying to answer, each
clinical trial protocol clearly states who can or cannot join
the trial.
Common criteria for entering a trial:
- Having a certain type or stage of cancer
- Having received a certain kind of therapy in the past
- Being in a certain age group
Criteria such as these help ensure that people in the trial
are as alike as possible. This way doctors can be sure that
the results are due to the treatment being studied and not
other factors.
These criteria also help ensure:
- Safety
Some people have health problems besides cancer that
could be made worse by the treatments in a study. If you
are interested in joining a trial, you will receive medical
tests to be sure that you are not put at increased risk.
- Accurate and meaningful study results
You may not be able to join some clinical trials if you
already have had another kind of treatment for your
cancer. Otherwise, doctors could not be sure whether
your results were due to the treatment being studied or
the earlier treatment.
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Randomization
Randomization is a process used in some clinical trials to
prevent bias. Bias occurs when a trial's results are affected by
human choices or other factors not related to the treatments
being tested. Randomization helps ensure that unknown
factors do not affect trial results.
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In a randomized clinical trial, you will be assigned by chance
to either a control group or an investigational group. |
Randomization is used in all phase III and some phase II
trials. These trials are called randomized clinical trials.
If you participate in such a trial, you will be assigned by
chance to either an investigational group or a control group.
Your assignment will be determined with a computer
program or table of random numbers.
- If you are assigned to the control group, you will get the
most widely accepted treatment (standard treatment) for
your cancer.
- If you are assigned to the investigational group, you will
get the new treatment being tested.
Comparing these groups to each other often clearly shows
which treatment is more effective or has fewer side effects. If
you are thinking about joining a randomized clinical trial,
you need to understand that you have an equal chance to be
assigned to either one of the groups. The doctor does not
choose the group for you.
Will I get a placebo?
A placebo is designed to look like the medicine
being tested, but it is not active. Placebos are
almost never used in cancer treatment trials.
In some cases, a study may compare standard
treatment plus a new treatment, to standard
treatment plus a placebo. You will be told if
the study uses a placebo.
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Patient Protection
Federal rules help ensure that clinical trials are run in an ethical
manner. Your rights and safety are protected through:
- Informed consent
- Careful review and approval of the clinical trial protocol
by two review panels. These panels include:
- A scientific review panel
- An institutional review board (IRB)
- Ongoing monitoring provided during the trial by:
- The IRB
- Data and Safety Monitoring Boards (DSMBs) for phase III trials
- Your research team
Informed consent is a process through which you learn the
purpose, risks, and benefits of a clinical trial before deciding
whether to join. It is a critical part of ensuring patient safety
in research. During the informed consent process you learn
important information about a clinical trial. This
information can help you decide whether to join.
During the informed consent process,
you learn important information about
the clinical trial that can help you decide
whether to take part.
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The research team, which is made up of doctors and nurses,
first explains the trial to you. The team explains the trial's:
- Purpose
- Procedures
- Risks and benefits
They will also discuss your rights, including your right to:
- Make a decision about participating
- Leave the study at any time
If you decide to leave the
study, your doctor will
discuss other treatment
options with you.
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Before agreeing to take
part in a trial, you have the right to:
- Learn about all your treatment options
- Learn all that is involved in the trial - including all details about treatment, tests, and possible risks and benefits
- Discuss the trial with the principal investigator and other members of the research team
- Both hear and read the information in language you can understand
After discussing all aspects of the study with you, the team gives
you an informed consent form to read. The form includes
written details about the information that was discussed and
also describes the privacy of your records. If you agree to take
part in the study, you sign the form. But even after you sign the
consent form, you can leave the study at any time.
Most clinical trials have to go through different types of
review that are designed to protect all people who take part.
These reviews are conducted by scientific review panels,
Institutional Review Boards (IRBs), and Data and Safety
Monitoring Boards (DSMBs).
This panel is made up of experts who review a clinical trial
protocol before it starts accepting patients to make sure it is
based on sound science. All clinical trials that are funded by
the Government must go through this review.Many other
clinical trial sponsors, such as drug companies, also seek
expert advice on the scientific merit of their trial protocols.
This board also reviews a clinical trial protocol before it starts
accepting patients. The board members make sure the risks
involved in the trial are reasonable when compared to the
possible benefits. They also closely watch the ongoing
progress of the trial from beginning to end.
Federal rules require that each IRB be made up of at least 5
people. One member must be from outside the institution
running the trial. IRBs are usually made up of a mix of
medical specialists and members of the community.
Many include members from diverse careers and
backgrounds. In most cases IRBs are located where the
trial is to take place. Many institutions that carry out
clinical trials have their own IRBs.
For phase III trials, DSMBs monitor the trial to help ensure
your safety. They may also be appropriate and necessary for
certain phase I and II clinical trials. A DSMB is an
independent committee made up of statisticians, physicians,
and other experts.
The Board must:
- Ensure that any risks that come from being in the study are reduced as much as possible
- Ensure that the data are sound
- Stop a trial if safety concerns come up or as soon as its objectives have been met
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Deciding to Take Part in Clinical Trials
Whenever you need treatment for your cancer, clinical trials
may be an option for you. Choosing to join a clinical trial is
something only you, those close to you, and your doctors and
nurses can decide together. This section has information you
can use when thinking about your treatment choices and
making your decision.
Weighing the Pros and Cons
As a treatment option, a clinical trial has possible benefits as
well as drawbacks. You may want to discuss the following
issues with your doctor and the people close to you.
Possible Benefits
- Clinical trials offer high-quality cancer care. If you are in
a randomized study and do not receive the new treatment
being tested, you will receive the best known standard
treatment. This may be as good as, or better than, the
new approach.
- If a new treatment is proven to work and you are taking
it, you may be among the first to benefit.
- By looking at the pros and cons of clinical trials and your
other treatment choices, you are taking an active role in a
decision that affects your life.
- You have the chance to help others and improve
cancer treatment.
Possible Drawbacks
- New treatments under study are not always better than,
or even as good as, standard care.
- If you receive standard care instead of the new
treatment being tested, it may not be as effective as
the new approach.
- New treatments may have side effects that doctors do not
expect or that are worse than those of standard treatment.
- Even if a new treatment has benefits, it may not work for
you. Even standard treatments, proven effective for many
people, do not help everyone.
- Health insurance and managed care providers do not
always cover all patient care costs in a study. What they
cover varies by plan and by study. To find out in advance
what costs are likely to be paid in your case, check with
your insurance company and talk to a doctor, nurse or
social worker from the study.
If a new treatment is proven to work
and you are taking it, you may be
among the first to benefit.
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Questions to Ask
If you are thinking about taking part in a clinical trial, here
are some questions that can help you decide.
About this trial
- Why is this trial being done?
- Why do the doctors who designed the trial believe that the treatment being studied may be better than the one being used now? Why may it not be better?
- How long will I be in the trial?
- What kinds of tests and treatments are involved?
- What are the possible side effects or risks of the new treatment?
- What are the possible benefits?
- How will the doctor know if the treatment is working?
Costs
- Will I have to pay for any of the treatments or tests?
- What costs will my health insurance cover?
Daily life
- How could the trial affect my daily life?
- How often will I have to come to the hospital or clinic?
- Will I have to travel long distances?
Comparing choices
- What are my other treatment choices, including standard treatments?
- How does the treatment I would receive in this trial compare with the other treatment choices?
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How to Find Clinical Trials
The National Cancer Institute, drug companies, medical
institutions, and other organizations sponsor clinical trials.
Clinical trials take place in many settings, such as
cancer centers, large medical centers, small hospitals,
and doctors' offices.
The National Cancer Institute maintains the most complete
database of cancer clinical trials in the country. This database
is called PDQ®. The following resources from the National
Cancer Institute can help you search PDQ® and see if there
is a trial for your type and stage of cancer.
Cancer Information Service
Toll-free: | 1-800-4-CANCER (1-800-422-6237) |
TTY: | 1-800-332-8615 |
Answers questions about cancer clinical trials and cancer-related
services and helps users find information on the NCI
Web site. Provides NCI printed materials. |
Online: | http://www.cancer.gov/clinicaltrials |
Chat online: | www.cancer.gov/help |
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