What statement best describes the relationship between exploratory and confirmatory trials?

• A. Confirmatory trials may proceed without any exploratory data.
• B. Exploratory trials are designed to provide final evidence.
• C. There is a logical link: confirmatory hypotheses are commonly informed by exploratory work.
• D. Exploratory trials must be completed before any regulatory submission.

Answer: (C)

In trial strategy, exploratory work is used to generate hypotheses and identify promising doses, populations, and endpoints, while confirmatory trials are designed to test those predefined hypotheses with a rigorous statistical plan to provide definitive evidence for regulatory decisions. Because of that, a key relationship emerges: the hypotheses and design choices in confirmatory trials are commonly informed by what was learned in exploratory investigations. This link is what makes the statement the best description of their relationship.

While it’s possible in some cases to proceed based on prior knowledge without extensive exploratory data, the standard approach is that exploratory findings guide the confirmatory program. Exploratory work isn’t meant to provide final evidence; its purpose is to explore and generate hypotheses, not to confirm efficacy. And regulatory submissions can be based on confirmatory evidence, with the possibility that exploratory work continues or remains ongoing in the background.