Placebo, standard therapy, study drug – what will I receive?
Why cancer trials almost never give “only” a placebo and what “standard therapy” actually means.
Hardly any term causes as much uncertainty in conversations about trials as the placebo. The worry behind it: “Will I end up with no treatment at all?” In cancer trials this worry is almost always unfounded.
Standard therapy: the established treatment
Standard therapy is the treatment that is recommended according to current knowledge. It is the benchmark every new treatment has to be measured against. Anyone allocated to the comparison group in a trial usually receives exactly this standard therapy.
Study drug: the new treatment
The study drug is the substance or combination the trial is about. It is often given in addition to standard therapy or replaces part of it. The flow graphic on every trial page shows exactly what is compared.
Why a placebo at all?
A placebo makes sure that expectations do not distort the result. If neither you nor the study team knows who receives which treatment, efficacy and side effects can be assessed fairly. Safety-relevant information remains available to the study team at all times.
At the first conversation, ask specifically about the study arms and what the comparison group receives. You have a right to an understandable answer.
This information is not a substitute for a conversation with your doctor.