Questions to ask before you join a cancer clinical trial

Before joining a trial, you must understand what the trial is testing, what each group receives, whether a placebo is used, what extra visits and tests are involved, what side effects are known and what is still unknown. Ask which phase the trial is, because an early phase one study mainly tests safety and how much of a medicine can be given, while a phase three trial compares a new treatment with standard care. Ask whether the trial is registered on the Clinical Trials Registry – India and which ethics committee approved it. Ask who to call at night if something goes wrong. Write every question down, and do not sign until each has a clear answer.

Three areas are often skipped and matter most. On cost, ask what the sponsor pays for, what you or your insurer may still pay, whether travel is reimbursed and who pays for care if you are harmed. On withdrawal, ask what happens if you leave, whether your standard treatment continues without delay and whether information already collected will still be used. On alternatives, ask what treatment your oncologist would recommend if you did not join, and how it compares. You can withdraw at any time without giving a reason, and saying no will not affect your care. A trial may not benefit you personally, so the alternatives deserve equal attention.

Take someone you trust. A relative or friend can listen while you absorb difficult information, write down answers, and later remind you of details you missed. Choose someone calm who will help you think rather than decide for you. If possible, bring a person who reads the language of the consent documents comfortably, and ask whether an interpreter is available if needed. Take your reports, a list of medicines and your treating oncologist's details. After the meeting, go through the answers with your oncologist, who can view the trial from outside. The decision to join remains voluntary and yours, and there is no need to decide on the day.

Write your questions down

Tick each one off when it is answered.

Alternatives matter as much as the trial

Standard care deserves equal attention.

Take someone with you

Two people remember more than one.

It cannot give you the answers to these questions for any particular trial. Only the trial team and its documents can do that.

It also cannot tell you whether to join. That decision belongs to you, with your oncologist's advice.

Questions about the purpose

Ask what question the trial is trying to answer and why it matters. Is it testing a new medicine, a new combination, a different schedule, or a way to ease side effects? Understanding the purpose helps you judge what taking part means for you, and whether the trial's aims match your own priorities.

Questions about the phase

Ask directly which phase the trial is. Phase one trials mainly look at safety and how much of a medicine can be given, and are not designed mainly to treat. Phase two and phase three trials look more closely at whether a treatment works. Each carries a different balance of uncertainty.

Questions about side effects

Ask which side effects have been seen so far, how common they seem in general terms, and what is still unknown. Ask how side effects will be monitored and treated, whether you will be given a contact card, and what you should do if you feel unwell at home.

Questions about the schedule

Ask how many visits, tests and scans the trial needs beyond standard care, how long each visit takes and how long the trial lasts overall. For families travelling from district towns, ask whether any checks can happen nearer home, and whether appointments can be grouped together.

Questions about placebo and groups

Ask whether a placebo is used, whether it is added to standard treatment or given alone, how groups are chosen and whether you will know your group. Ask whether switching to the new treatment later is allowed. The answers shape what you might actually receive by joining.

Questions about cost

Ask for a written list of what the sponsor covers, what remains your cost and how insurance or government schemes treat care during a trial. Ask whether travel, stays or a companion's expenses are reimbursed, how claims work, and what happens to costs if you leave early.

Questions about harm

Ask what happens if you are harmed by taking part, who pays for treatment of that harm, and how compensation is decided. Indian rules require medical management for trial-related injury. The trial team should explain the process for this particular study clearly, and it should appear in the consent documents.

Questions about withdrawal

Ask what you need to do to leave, whether you must give a reason, whether a final safety visit is needed and how your care continues afterwards. Confirm that your standard treatment will not be delayed or affected. Knowing the exit route clearly can make the whole decision feel lighter.

Questions about after the trial

Ask whether you will be told the results, whether the trial medicine could continue if it seems to help you, and what follow-up happens once the study ends. Some trials offer continued access; others do not. Knowing this avoids disappointment later and helps you plan your ongoing care.

Questions about privacy

Ask who will see your medical records, how your personal details are protected, and whether your samples will be stored or used for future research. You are entitled to understand this, and to ask whether you can agree to the main trial without agreeing to extra sample storage.

Questions for your own oncologist

Your treating oncologist can answer different questions: how the trial compares with standard care for you, whether the phase suits your situation, and whether the extra burden is realistic. Ask them to review the information sheet with you. Their view from outside the trial is valuable and independent.

Keeping this list

Print or copy these questions and take them to every discussion. Ask the team to answer in plain words, and note the answers beside each one. Bring the list back to your oncologist. Having everything written down makes it far easier to talk calmly with family at home.

What to do next

Print this list, choose someone to come with you, ask every question, request the documents in your language, check the trial on CTRI, and review the answers with your treating oncologist before making any decision.