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Related Concept Videos

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Crossover Experiments

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Crossover experiments, also called the repeated-measurements design, is a study design in which all experimental units are exposed to all treatments in different periods. Crossover experiments are generally used in psychology, the pharmaceutical industry, agriculture, and medicine.
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Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches01:23

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Biopharmaceutical studies constitute a vital field aiming to enhance drug delivery methods and refine therapeutic approaches, drawing upon diverse interdisciplinary knowledge. In research methodologies, the choice between controlled and non-controlled studies significantly influences the study's reliability and accuracy.
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Group Design

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The most basic experimental design involves two groups: the experimental group and the control group. The two groups are designed to be the same except for one difference— experimental manipulation. The experimental group gets the experimental manipulation—that is, the treatment or variable being tested—and the control group does not. Since experimental manipulation is the only difference between the experimental and control groups, we can be sure that any differences between...
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A study design is a set of techniques that allow a researcher to collect and analyze data from different variables defined for a specific research problem. Statistics is commonly for effective study design and more robust experiments,
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An experimental design is a systematic process that allows researchers to evaluate the relationship between dependent and independent variables. There are three widely used types of experimental design - pre-experimental design, true experimental design, and quasi-experimental design. In pre-experimental design, the researcher compares the data before and after some interventions or treatments. The true-experimental design has more than one purposefully created group, a commonly measured...
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Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which...
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Related Experiment Video

Updated: Jun 30, 2025

A Clinical Trial Assessing the Safety, Efficacy, and Delivery of Olive-Oil-Based Three-Chamber Bags for Parenteral Nutrition
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Single-arm phase 3 designs: An oxymoron?

Aya Hussein1, Vincent Levy2, Sylvie Chevret3

  • 1ECSTRRA, 1, avenue Claude Vellefaux, Paris 75010, France.

Contemporary Clinical Trials
|March 20, 2024
PubMed
Summary
This summary is machine-generated.

Single-arm phase 3 trials are increasingly used, even after randomized clinical trials (RCTs). Justifications for these designs as confirmatory evidence require clearer reporting and bias assessment.

Keywords:
Phase 3 trialSingle-arm

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Area of Science:

  • Clinical Trials Methodology
  • Drug Development Evaluation
  • Evidence-Based Medicine

Background:

  • Randomized clinical trials (RCTs) are the established standard for drug benefit confirmation.
  • Phase 3 trials, critical for drug evaluation, are typically recommended as RCTs.
  • Despite recommendations, single-arm phase 3 trials persist in clinical research.

Purpose of the Study:

  • To investigate the utilization of single-arm designs in phase 3 clinical trials.
  • To categorize the historical context and diagnostic areas of these trials.
  • To assess the reported justifications for employing single-arm phase 3 designs.

Main Methods:

  • A comprehensive PubMed search was conducted to identify single-arm phase 3 trials.
  • Trials were categorized based on prior study designs (RCT, other, none) and diagnostic setting.
  • Data on the justification for design choice were extracted and analyzed.

Main Results:

  • 176 single-arm phase 3 trials were identified, showing exponential growth since 1994.
  • These trials varied in their preceding study designs: 36% followed an RCT, 33% a non-randomized trial, and 31% had no prior trial.
  • Justification was reported in only 18% of trials, with ethical concerns being a common reason.

Conclusions:

  • The application of single-arm phase 3 trials is diverse, used from initial studies to confirmatory phases post-RCT.
  • Clearer reporting of justifications for single-arm designs as confirmatory evidence is needed.
  • Potential sources of bias in single-arm phase 3 trials warrant careful consideration and documentation.