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Updated: Feb 7, 2026

X-ray Dose Reduction through Adaptive Exposure in Fluoroscopic Imaging
Published on: September 11, 2011
Seamless phase IIa/IIb adaptive design with the same primary endpoint for proof of concept and dose finding
Jiacheng Yuan1, Daniel Radecki1, Denise Bugarin1
1Allergan Inc., 2525 Dupont Drive, Irvine, CA 92612, USA.
Abstract:
This paper considers combining a proof of concept (POC) study and a dose finding (DF) study where the POC and the DF share the same primary endpoint. An example based on real study conditions shows that compared to a conventional design the proposed adaptive design tests more active doses, with a smaller sample size and a shorter overall duration leading to a budget saving of 30% in study operations.
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