- 20–80 participants
- Studies the initial safety of an investigational drug
- Participants in Phase 1 studies are usually healthy volunteers
A placebo is something that looks exactly like the investigational drug, and is delivered in exactly the same way, but does not contain any active drug. Placebos help scientists to see whether any changes are due to the investigational drug in question, or some other factor.
Note: This information is about clinical trials in general—it is not specific to TANGO. The safety of participants is always the first priority of any clinical study.