What happens in a clinical trial – step by step
From the first examination to follow-up: which stages there are, what randomization means and why you can leave at any time.
A clinical trial follows a fixed sequence that was reviewed in advance by an ethics committee and the authorities. For you as a participant this means: every step is planned, documented and accompanied. In this article we walk through the stages – from the first question to the end.
1. The first conversation
It always starts with a conversation with your treating physician. This is where it is clarified whether a trial is an option at all. You receive the written patient information and have time to ask questions – several days if you wish.
2. Checking the requirements
Every trial has inclusion and exclusion criteria: age, diagnosis, previous treatments, comorbidities. The study team checks these using your records and usually a few additional examinations (screening). Not every person fits every trial – that is not a judgement about you, but about the question the trial asks.
3. Allocation and treatment
In many trials participants are allocated to a group at random (randomization). This allows a fair comparison of whether a new treatment works better than the existing one. In cancer trials you practically always receive at least the standard therapy – a pure placebo is the exception.
4. Follow-up
After the treatment phase the study team continues to accompany you: with regular check-ups, often over months or years. This data is just as important for evaluating the trial as the treatment itself.
Whether and when participation makes sense for you is a decision you make together with your care team. Studiefinden helps you prepare the questions for it.
This information is not a substitute for a conversation with your doctor.