What is informed consent in clinical trials?
You've just found a clinical trial that might be a fit. The study team sends over a document. It's 30 pages long, dense with medical language, and you're expected to review it — possibly within days. You're already exhausted, and now this.
This is the informed consent process. For many GBM patients and caregivers, it's one of the most confusing parts of trial enrollment — and one of the least talked about. This guide walks you through exactly what it is, what to expect, and how to approach it without feeling overwhelmed.
What Is Informed Consent in a Clinical Trial?
Informed consent is a formal process — not just a signature. Before you can join a clinical trial, the study team is required by law to make sure you fully understand what you're agreeing to. That includes the purpose of the trial, what will happen at each visit, what the known risks and potential benefits are, and what alternatives exist.
The process results in a document called an Informed Consent Form, or ICF. Think of it less as a contract and more as a detailed information packet you read together with the research team before deciding whether to proceed.
Signing it doesn't mean you're locked in. It means you've been informed and you're agreeing to participate — for now.
What's Actually in the Informed Consent Form?
ICFs are required to cover specific ground. According to FDA guidance and standard research regulations, every form must include:
- The purpose of the study — what the researchers are trying to learn
- What participation involves — visits, tests, procedures, and how long each takes
- Known risks and discomforts — including side effects reported in earlier testing
- Potential benefits — for you and for future patients (these are often stated carefully and without guarantees)
- Your alternatives — what your options are if you don't join the trial
- Confidentiality — how your medical information will be used and protected
- Costs and compensation — what the trial covers, what it doesn't, and whether any travel support is available
- Your right to withdraw — at any time, for any reason, without penalty
That last point matters more than many patients realize. Signing the ICF is not permanent. You can leave a trial at any point, and your standard medical care cannot be withheld if you do.
What Happens During the Consent Meeting?
Before you sign anything, the study team — usually a research coordinator or the principal investigator — will sit down with you (and your caregiver or support person, if you bring one) to walk through the form. This meeting can take an hour or more. That's by design.
You are encouraged to ask questions. The study team expects it. Some patients find it helpful to write questions in the margins of the form as they read. Others bring a notebook or ask a family member to take notes while they listen.
The National Cancer Institute recommends taking the consent form home before signing, reading it somewhere comfortable, and bringing it back with questions marked.
After the meeting, if you have follow-up questions, you can and should contact the study coordinator. Their contact information will be in the form.
How Long Does the Consent Process Take?
The timeline varies. Some patients receive the ICF several days before a consent meeting. Others receive it at the meeting itself. Either way, you are entitled to time to review it — you should never feel rushed.
Once you sign, the next step is typically a screening visit, where the team confirms you meet the eligibility criteria. Signing the ICF does not guarantee you'll be enrolled. It authorizes the team to screen you.
What to Bring (and Who to Bring)
Having another person in the room changes the experience. They can listen while you focus on asking questions. They can catch details you miss. They can help you process the information afterward.
Bring:
- A trusted family member or friend
- A list of questions you've prepared in advance (see below)
- A notepad or the ability to record the conversation (ask permission first)
- Your current medication list, in case side effect questions come up
What This Means for Patients
The informed consent process is your formal opportunity to understand what you're committing to and to ask every question you have before committing to anything.
The National Brain Tumor Society notes that trial consent forms will specifically outline costs, payments, and expenses covered by the trial. This is your chance to ask about travel reimbursement, lodging support, and whether any out-of-pocket costs are expected. Don't assume — ask.
If something in the form is unclear, the study team is obligated to explain it in plain language. If they can't, or won't, that tells you something important.
Questions to Ask Before You Sign
You don't need to memorize these. Print this list and bring it:
- What exactly will happen at each visit, and how long will each one take?
- Which parts of my care will be covered by the trial, and which will be billed to my insurance?
- What happens if I need to stop participating — how will my care continue?
- Is there travel support available, and how do I apply for it?
- Who do I call if I have a side effect or an urgent question outside of clinic hours?
- Can I continue my other medications while on the trial?
- What will happen to my medical data, and who will have access to it?
- If the trial ends early, what happens to my treatment?
There are no wrong questions here. A good study team will welcome all of them.
You Can Say No — or Change Your Mind
Participation in a clinical trial is always voluntary. You can decline to sign. You can sign and then withdraw later. Your relationship with your medical team and your access to standard care cannot depend on your decision to participate.
Taking time to understand the consent form fully is not a sign of hesitation. It's exactly what the process is designed for.
How to Find Trials Worth Considering
If you're still in the process of finding a trial to evaluate, PACT AI can help match you to open GBM trials based on your specific situation — diagnosis, prior treatments, location, and more. Visit pact-ai.com to get started. Once you have a trial in mind, you can also look up its full details, including study contacts, at ClinicalTrials.gov.
Frequently Asked Questions
Does signing the informed consent form mean I'm officially enrolled in the trial?
No. Signing the ICF means you've been informed and you authorize the team to screen you. Enrollment happens after screening confirms you meet the eligibility criteria.
Can I bring someone with me to the consent meeting?
Yes, and it's strongly encouraged. A second person can take notes, ask follow-up questions, and help you process the information after the meeting.
What if I don't understand something in the consent form?
Ask the study team to explain it. They are required to provide explanations in plain language. You can also ask for time to take the form home and review it before signing.
Can I leave a trial after I've already started?
Yes. You can withdraw from a trial at any time and for any reason. Your standard medical care cannot be withheld or compromised because you chose to leave.
This post is for informational purposes only and does not constitute medical advice.