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Updated: Apr 21, 2026

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Backfill Bayesian Ordered Lattice Design for Phase I Clinical Trials.

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    This summary is machine-generated.

    The new backfill Bayesian Ordered Lattice Design (BF-BOLD) improves early phase clinical trials by enhancing safety and activity assessment. This method helps determine optimal biological doses more effectively, supporting sustainable treatment development.

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    Area of Science:

    • Clinical Trials Methodology
    • Pharmacometrics and Quantitative Pharmacology
    • Drug Development and Regulatory Science

    Background:

    • Conventional Phase I clinical trial designs often struggle to consistently identify safe and effective dose levels.
    • The US Food and Drug Administration's Project Optimus aims to reform dose optimization and selection paradigms in drug development.
    • There is a need for improved methods to balance dose-finding with early assessment of therapeutic activity.

    Purpose of the Study:

    • To extend the Bayesian Ordered Lattice Design (BOLD) for Phase I trials by incorporating a backfill approach.
    • To introduce a novel backfill BOLD (BF-BOLD) design that integrates dose-finding with patient activity evaluation.
    • To establish a straightforward method for determining the optimal biological dose (OBD) by identifying the maximum tolerated dose (MTD) and assessing activity below it.

    Main Methods:

    • The proposed backfill BOLD (BF-BOLD) design builds upon the existing BOLD methodology for dose escalation.
    • It incorporates an activity assessment for each patient enrolled in the trial.
    • The optimal biological dose (OBD) is determined by first identifying the maximum tolerated dose (MTD) and then evaluating activity rates at doses below the MTD.

    Main Results:

    • Simulation results indicate that BF-BOLD enhances both safety and activity assessments in dose-finding trials.
    • The BF-BOLD approach improves treatment sustainability and preserves the potential efficacy of the Recommended Phase II Dose (RP2D).
    • The backfill design effectively reduces overdose rates and offers a more attractive alternative to traditional dose expansion trials.

    Conclusions:

    • The backfill Bayesian Ordered Lattice Design (BF-BOLD) is a robust and efficient approach for Phase I clinical trials.
    • BF-BOLD enhances the assessment of both safety and activity, leading to better dose selection and improved treatment outcomes.
    • Backfill designs represent a significant advancement in early-phase trial design, offering a more effective strategy for dose optimization.