Medical Oncologist
CION Cancer Clinics
What phase 1, 2 and 3 mean in a liver cancer trial | CION Cancer Clinics
The phase tells you how far a new treatment has come in testing. Phase 1 checks safety, phase 2 checks whether it acts on the cancer, and phase 3 compares it with the treatment people already get. This page explains each phase, how early and late trials feel different for a patient, and what the phase number cannot tell you. At CION Cancer Clinics, a multidisciplinary tumour board weighs your liver function and your scans before recommending any treatment.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed October 2026, next review due October 2027
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On this page
- What do phase 1, 2 and 3 mean in a clinical trial?
- What is each phase trying to find out?
- How does a new liver cancer treatment reach patients?
- How do early and late phase trials differ for a patient?
- Does a higher phase number mean a better treatment?
- What this page cannot tell you
- Common questions about trial phases
The short answer
What do phase 1, 2 and 3 mean in a clinical trial?
The phase tells you how far a new treatment has travelled in testing. Phase 1 asks whether it is safe and what amount to give. Phase 2 asks whether it shrinks or controls the cancer. Phase 3 asks whether it works better than the treatment people already receive.
Why the phase matters to you
Each phase carries a different balance of what is known and what is not. In an early trial, very few people have had the treatment before you, and the side effects are still being learned. In a later trial, a great deal is already known, and you are usually compared against standard care, so everyone is treated.
What the phase does not tell you
The phase does not tell you whether the treatment will work for you. A promising early result can fail in a larger trial, and that happens often. It also does not tell you whether the trial is well run. That depends on the approvals behind it and the team running it, which our page on what clinical trials are explains.
This page is written to inform you about trial phases. It does not recruit for any study.Phase by phase
What is each phase trying to find out?
The phases build on each other. A treatment only moves to the next one if the earlier results justify it.
Phase 1: is it safe?
A small group of people receive the new treatment, often starting at a low amount that is raised carefully. The team watches closely for side effects. People who join usually have liver cancer that has not responded to standard options.
Phase 2: does it act on the cancer?
A larger group receives the treatment to see whether tumours shrink or stop growing on scans. Safety is still watched. Some phase 2 trials compare two groups; many do not.
Phase 3: is it better than what we have?
Many people, often across several countries, are randomly placed in one of two or more groups. One group usually receives the current standard treatment. These trials decide whether a treatment becomes the new standard.
Usually looks like
- A computer decides your group
- One group receives standard care
- Results judged on living longer or living better
Phase 4: after approval
Once a medicine is approved and in wide use, studies continue to look for rare or long-term side effects that smaller trials could not pick up.
Not sure whether this applies to you?
Ask an oncologistFrom laboratory to clinic
How does a new liver cancer treatment reach patients?
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Laboratory and animal studies
Before anyone receives it, the treatment is tested on cancer cells and in animals. Most ideas stop here.
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Approval to test in people
The regulator and an ethics committee review the plan. In India the trial must also be registered publicly before anyone is enrolled.
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Phase 1, then phase 2
Safety comes first. Only if the treatment seems safe enough, and shows some effect on the cancer, does it move forward.
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Phase 3 comparison
The treatment is compared with standard care in a large group. This is the step where many promising treatments fall short.
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Approval and wider use
If phase 3 shows a real benefit, regulators may approve it. Approval in another country does not mean it is approved or available in India at the same time.
Side by side
How do early and late phase trials differ for a patient?
Early phase (1 and 2)
Late phase (3)
Little is known about side effects yet
Side effects are already fairly well described
Everyone usually gets the new treatment
You may get the new treatment or standard care
Often for people who have used standard options
Often for people at an earlier point in treatment
Run at fewer centres, often in big cities
Run at many centres, sometimes across countries
More frequent visits and blood tests
Visits closer to routine care, with extra scans
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Commonly believed
Does a higher phase number mean a better treatment?
"Phase 3 means the drug is already proven."
Phase 3 is the test that tries to prove it. The treatment looked promising earlier, but many phase 3 trials end without showing a benefit over standard care.
"Phase 1 means you are the first human ever."
Sometimes, but not always. Many phase 1 liver cancer trials test a medicine already used for other cancers, or a new combination of approved medicines.
"In phase 3 I might get a sugar pill instead of treatment."
In liver cancer, the comparison group usually receives the current standard treatment. A placebo, if used at all, is normally added on top of real treatment, and the information sheet will say so.
"A drug approved abroad will be available here soon."
Approval in India is a separate process. A medicine can be in standard use elsewhere and still be unavailable here, or only available through a trial or by import.
Being straight with you
What this page cannot tell you
It cannot tell you which phase, if any, suits you. That depends on your type of liver cancer, its stage, how well your liver is working and which treatments you have already had. Your oncologist and the tumour board can judge those together.
Who this does not apply to
Phase 1 trials are rarely suitable for people whose cancer can still be treated with surgery, ablation or a standard medicine. Most trials of any phase also leave out people with advanced cirrhosis, because the liver cannot safely handle an untested treatment. If the cancer in your liver spread from another organ, look for trials for that original cancer instead.
Where to go next
Read about newer combinations being studied and the questions to ask before joining. For a wider view of phases across cancers, see trial phases explained.
Questions we are asked
Common questions about trial phases
Which phase is the safest to join?
Later phases carry fewer unknowns, because more people have already received the treatment. That does not make an early trial reckless. Phase 1 teams watch patients very closely. The right question is whether the risks are worth it for you, and that is a conversation with your oncologist.
Is a phase 1 trial only for people who are very ill?
Often it is for people whose cancer has not responded to standard options, but they still need to be well enough to take part safely. Most phase 1 trials need reasonable liver function and the ability to manage daily life without much help.
What is a phase 1/2 or phase 2/3 trial?
Some trials combine two phases in one study to save time. A phase 1/2 trial first checks safety, then moves straight into checking whether the treatment acts on the cancer. The information sheet will tell you which part you are joining.
Can I choose which group I am in?
Not in a randomised trial. A computer decides the group so the comparison is fair. If being in a particular group matters to you, say so before you sign. You can decide not to join if you cannot accept the chance of either group.
Will I know which treatment I am getting?
In some trials you and your doctor both know. In others, called blinded trials, neither may know until the study ends. In an emergency, the team can find out quickly so that you are treated safely.
Do phase 3 trials happen in India?
Yes. Many international liver cancer trials include Indian centres, and all of them must be registered on the Clinical Trials Registry - India. Our page on finding trials in India explains how to search it.
If a phase 3 trial succeeds, do I keep getting the treatment?
It depends on the trial. Some sponsors continue to provide the treatment to participants who are benefiting, and others do not. Ask what happens after the trial ends, and get the answer in writing before you sign.
Who can explain a trial I have been offered?
Start with the research team and your treating oncologist. If you would like an independent view, call the CION helpline. A CION oncologist can read the information sheet with you and explain what the phase means in your situation.
Your Specialists
Meet CION's liver cancer specialists. Bring your scan reports and liver blood tests.
Our medical and surgical oncologists plan liver cancer care together, weighing the tumour and how well your liver works before choosing surgery, a liver-directed procedure or medicines.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
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Sources
- American Cancer Society — Clinical Trials
- MedlinePlus — Clinical Trials
- Cancer Research UK — Research and clinical trials for liver cancer
- Clinical Trials Registry - India — Clinical Trials Registry - India
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Clinical Trials for Liver Cancer: What They AreStart here if trials are new to youQuestions to Ask Before Joining a TrialA list to take to the research teamHow to Find Liver Cancer Trials in IndiaWhere trials are listed and how to searchNewer Combinations Being Studied in Liver CancerWhat the current trials are actually testing
Talk to us
Been offered a trial and unsure what the phase means?
Bring the information sheet and we will go through it with you in plain language, with no pressure to join or refuse. One helpline serves every CION centre.