Single arm studies
Why are companies often running single arm studies in development? What are the potential drawbacks and why is it not a binary choice between full comparative study and single arm trial? What are solutions in between to find a balance between feasibility and rigour? Single arm studies are a popular method for collecting data despite being critiqued for decades. It is a type of research design in which the investigator only observes one group of participants over time. This design is often used when sponsors claim it would be unethical to randomise patients into different groups or when comparing two treatments would …


