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    • Phase I Clinical Trial Designs: Bayesian Optimal Interval Design (BOIN)

    Phase I Clinical Trial Designs: Bayesian Optimal Interval Design (BOIN)

    by Ed Matthews on January 19, 2022 — 3 minute read

    Looking Beyond 3+3 for Phase I Designs

    Determining the Maximum Tolerated Dose (MTD) or Recommended Phase 2 Dose (RP2D) of a potential therapy is an essential early milestone which can set the tone for the entire clinical development program. Dose escalation methods for phase I cancer clinical trials fall into two broad classes—rule-based designs (which include the traditional 3+3 design and its variations) and model-based designs.

    The 3+3 design and its variations use simple, prespecified rules to guide dose escalation. Due to its simplicity, the 3+3 design has been dominant in phase I clinical trials for decades despite some uncertainty about the true MTD and tendency to treat patients at low doses that are potentially sub-therapeutic.

    More recently, model-based and model-assisted designs have grown in popularity due to their flexibility and effectiveness in early phase trials, often helping to correctly select the MTD and allocate more patients to the MTD.

    Introducing the Bayesian Optimal Interval Design (BOIN)

    Novel designs provide practitioners with additional tools for conducting more flexible and efficient phase I trials. Bayesian Optimal Interval Design (BOIN) is one such model-assisted design that provides a novel platform to design phase I trials with a single agent, drug combination, and late-onset toxicity under a unified framework. It combines the simplicity of the algorithm-based design and the superiority of the model-based, and can be implemented in an uncomplicated way.

    Flowchart of the BOIN Design

    Using the BOIN design, the observed DLT rate at the current dose is compared to pre-specified dose-escalation and de-escalation tolerances.

    Considerations for the BOIN design in oncology clinical trials

    What sets BOIN apart is the way it uses the observed dose-limiting toxicity (DLT) rate at the current dose to determine dose escalation and de-escalation. This approach is more transparent and assessable for non-statisticians, and is simple to calibrate to fit a design goal.

    Some have raised concerns regarding the possibility of aggressive dose escalation in BOIN trials, but studies show the BOIN design has a lower risk of overdosing patients than other designs and generally a higher probability of correctly selecting the MTD. More so, BOIN has been shown to rank among the top-performing designs for mitigating the risk of sub-therapeutic dosing, something possible with slow dose escalation designs.1

    While the BOIN design does require some initial assumptions—including the target DLT rate (often 30%), cohort sizes >6 (up to a defined limit), and a maximum sample size—the accessibility of the BOIN design is enhanced by its simulation software.

    With the assistance of experienced biostatisticians, the user-friendly platform can assist in the design and implementation of the BOIN design in phase I clinical trials, including single-agent and drug-combination trials. Supporting the collation and analysis of data for on-going computations and long-term statistics the BOIN design provides valuable insights that power clinical research.

    Key takeaway

    The BOIN design is powerful and under-utilized tool for phase I oncology clinical trials. However, it is not a magic bullet—no model is. Precision’s data science experts can assist you in selecting the right design for your unique study requirements. This allows you to harvest the most impactful data to propel your project forward for further study.

    To request a consultation with our experts, contact us.

     

    About the author

    Ed Matthews is a biostatistician with 26 years’ experience in medical statistics, having worked on multiple clinical studies, in a wide cross-section of therapeutic areas, focused on oncology, and in all clinical phases (I to IV). He is practiced in working on a variety of study requirements, including SAPs, electronic Case Report Forms (eCRFs), Clinical Study Reports (CSRs), protocols, clinical summaries and ISS/ISE, both in the UK, Europe and globally. Ed also has many years’ experience of PK analysis, in guiding and training both Statisticians and non-Statisticians, and experience with data safety boards as both an attendee and chair.

    Reference:

    1. Zhou H, Yuan Y, Nie L. Accuracy, Safety, and Reliability of Novel Phase I Trial Designs. Clin Cancer Res. 2018;24(18):4357-4364. doi:10.1158/1078-0432.CCR-18-0168.

    Precision for Medicine is part of the Precision Medicine Group, an integrated team of experts that extends Precision for Medicine’s therapeutic development capabilities beyond approval and into launch strategies, marketing communication, and payer insights. As one company, the Precision Medicine Group helps pharmaceutical and life-sciences clients conquer product development and commercialization challenges in a rapidly evolving environment.

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