Use of a synthetic control arm drawn from historical clinical trial data could provide better information about a new investigational agent’s safety and efficacy than single-arm studies and allow sponsors to conduct randomized trials that are smaller, or with more patients assigned to the investigational drug.
External Control Arms: Better Than Single-Arm Studies But No Replacement For Randomization
Synthetic control group derived from historical clinical trial data could augment smaller randomized trials and yield better information than single-arm studies, but this approach should not be viewed as a substitute for randomized trials where feasible, US FDA officials said at a Friends of Cancer Research meeting.

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