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Related Concept Videos

Clinical Trials: Overview01:11

Clinical Trials: Overview

Clinical development focuses on how the drug will interact with the human body and encompasses four key phases of clinical trials, each serving a specific purpose in assessing the safety and effectiveness of new drugs. These phases overlap and build upon one another. Phase I involves a small group of healthy volunteers (typically 20-80 individuals) or, in cases where significant toxicity is expected, patients with the targeted disease, such as cancer or AIDS. The volunteers are tested for...
Clinical Trials01:16

Clinical Trials

Clinical trials are prospective experimental studies conducted on humans to determine the safety and efficacy of treatments, drugs, diet methods, and medical devices. Using statistics in clinical trials enables researchers to derive reasonable and accurate conclusions from the collected data, allowing them to make wise decisions in uncertain situations. In medical research, statistical methods are crucial for preventing errors and bias.
There are four phases in a clinical trial. A phase one...
Bioequivalence Experimental Study Designs: Repeated Measures, Cross-Over, Carry-Over, and Latin Square Designs01:15

Bioequivalence Experimental Study Designs: Repeated Measures, Cross-Over, Carry-Over, and Latin Square Designs

Bioequivalence experimental study designs play a pivotal role in testing the effectiveness of various treatments. Key among these are the repeated measures, cross-over, carry-over, and Latin square designs. In the repeated measures design, each subject receives all treatments, allowing for temporal comparisons. This type of design is useful in reducing variability but requires careful planning to avoid bias.The cross-over design, an economical method, involves sequential administration of...
Preclinical Development: Overview01:28

Preclinical Development: Overview

Preclinical development consists of a series of tests that ensure the safety and efficacy of a new therapeutic compound before it is tested in humans. There are four main phases to this process. First, safety pharmacology tests are conducted to ensure the drug does not produce any acutely harmful effects. These tests examine parameters such as bronchoconstriction, cardiac dysrhythmias, blood pressure changes, and ataxia. Next, preliminary toxicological testing is performed to determine the...
Blinding01:11

Blinding

Blinding is a commonly used method of not telling participants which treatment a subject is receiving. Blinding is a critical part of a randomized control trial or RCT. It reduces the bias that affects the results. In an RCT, blinding is used in the form of a placebo. A placebo effect occurs when untreated subjects falsely believe they have received the treatment and report improved symptoms. A placebo or a dummy treatment is administered to subjects to negate the bias caused by such an effect.
Bioavailability Study Design: Healthy Subjects Versus Patients01:15

Bioavailability Study Design: Healthy Subjects Versus Patients

Bioavailability studies are essential for evaluating a drug's therapeutic efficacy and understanding its absorption patterns under various physiological conditions. Conducting such studies on target patient populations provides more relevant data by simulating real-world disease states. However, practical challenges often necessitate the use of young, healthy adult volunteers as study subjects.Patients may exhibit altered drug absorption patterns due to the effects of the disease itself,...

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A Clinical Trial Assessing the Safety, Efficacy, and Delivery of Olive-Oil-Based Three-Chamber Bags for Parenteral Nutrition
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Improving Efficiency in Geographic Atrophy Clinical Trials Using Run-In Phases or Single-Arm Designs.

Jintong Hou1, Leon von der Emde1,2, Souvick Mukherjee1

  • 1Division of Epidemiology and Clinical Applications, National Eye Institute, National Institutes of Health, Bethesda, Maryland.

JAMA Ophthalmology
|May 14, 2026
PubMed
Summary
This summary is machine-generated.

Incorporating run-in phases into randomized clinical trials (RCTs) or using single-arm designs can improve geographic atrophy (GA) trial efficiency. These methods leverage stable GA enlargement rates to reduce sample size requirements.

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Area of Science:

  • Ophthalmology
  • Clinical Trial Design
  • Biostatistics

Background:

  • Geographic atrophy (GA) exhibits stable enlargement rates, a characteristic that can be leveraged to enhance clinical trial efficiency.
  • Traditional randomized clinical trials (RCTs) may benefit from design modifications to optimize sample size and power.
  • Run-in phases and single-arm trial designs are potential strategies to improve efficiency in GA studies.

Purpose of the Study:

  • To evaluate the efficiency of incorporating run-in phases into RCTs for geographic atrophy (GA) trials.
  • To compare the efficiency of RCTs with run-in phases versus standard RCTs.
  • To assess the efficiency of single-arm trial designs compared to RCTs for GA studies.

Main Methods:

  • In silico power analyses and trial simulations were employed to estimate sample size requirements.
  • Parameters were derived from the GA Minocycline Trial, focusing on participants with specific baseline GA areas.
  • Linear mixed-model analyses were used, with validation through 10,000 empirical trial simulations.

Main Results:

  • RCTs incorporating run-in phases required smaller sample sizes compared to standard RCTs.
  • Increasing the duration of the run-in phase further reduced the estimated sample size.
  • Single-arm trials demonstrated greater efficiency, requiring substantially smaller sample sizes than RCTs.

Conclusions:

  • Incorporating run-in phases into RCTs or adopting single-arm designs can significantly improve the efficiency of geographic atrophy (GA) clinical trials.
  • These design modifications capitalize on the predictable enlargement rates of GA, leading to reduced sample size needs.
  • The findings suggest broader applicability to various GA trial designs, optimizing resource allocation and accelerating research.