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Related Concept Videos

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...
Bioequivalence Experimental Study Designs: Completely Randomized and Randomized Block Designs01:20

Bioequivalence Experimental Study Designs: Completely Randomized and Randomized Block Designs

Bioequivalence experimental study designs are crucial methodologies used in evaluating and comparing the bioavailability of different drug products. These designs are categorized into various types: completely randomized, randomized block, repeated measures, cross and carry-over, and Latin square designs.Completely randomized designs involve randomly allocating treatments to all subjects participating in the experiment. This allocation is achieved by assigning unique random numbers to subjects...
Randomized Experiments01:13

Randomized Experiments

The randomization process involves assigning study participants randomly to experimental or control groups based on their probability of being equally assigned. Randomization is meant to eliminate selection bias and balance known and unknown confounding factors so that the control group is similar to the treatment group as much as possible. A computer program and a random number generator can be used to assign participants to groups in a way that minimizes bias.
Simple randomization
Simple...
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...
Crossover Experiments01:16

Crossover Experiments

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.
Crossover designs are performed even with smaller sample sizes since the samples can act as their controls. These are better than simple randomized trials since patients are exposed to all the treatments.
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...

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Related Experiment Video

Updated: Jun 25, 2026

A Clinical Trial Assessing the Safety, Efficacy, and Delivery of Olive-Oil-Based Three-Chamber Bags for Parenteral Nutrition
04:53

A Clinical Trial Assessing the Safety, Efficacy, and Delivery of Olive-Oil-Based Three-Chamber Bags for Parenteral Nutrition

Published on: September 20, 2019

Randomized phase II designs.

Larry Rubinstein1, John Crowley, Percy Ivy

  • 1National Cancer Institute, Bethesda, Maryland, USA. rubinsteinl@ctep.nci.nih.gov

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
|March 12, 2009
PubMed
Summary
This summary is machine-generated.

Randomized phase II trials in oncology are increasingly used with targeted agents to improve survival. While reducing bias, these designs require larger sample sizes compared to historical controls, with the optimal choice depending on trial specifics.

Related Experiment Videos

Last Updated: Jun 25, 2026

A Clinical Trial Assessing the Safety, Efficacy, and Delivery of Olive-Oil-Based Three-Chamber Bags for Parenteral Nutrition
04:53

A Clinical Trial Assessing the Safety, Efficacy, and Delivery of Olive-Oil-Based Three-Chamber Bags for Parenteral Nutrition

Published on: September 20, 2019

Area of Science:

  • Oncology
  • Biostatistics
  • Clinical Trial Design

Background:

  • The rise of molecularly targeted agents in oncology necessitates robust clinical trial designs.
  • Phase II trials are crucial for evaluating efficacy, with increasing use of randomized designs over historical controls.

Purpose of the Study:

  • To review and compare statistical designs for historically controlled and randomized phase II trials.
  • To discuss the advantages, disadvantages, and statistical considerations of each design approach.
  • To provide guidance on selecting between historical controls and randomization in phase II oncology studies.

Main Methods:

  • Review of principal statistical designs for phase II trials (historically controlled vs. randomized).
  • Analysis of arguments for and against randomization in phase II studies.
  • Examination of methods for adjusting historical controls and error bounds in randomized studies.

Main Results:

  • Randomized designs minimize bias but increase sample size requirements.
  • Methods exist to adjust historical controls and optimize error bounds for randomized trials.
  • Sample size can be managed for detecting significant improvements in overall survival (OS) or progression-free survival (PFS).

Conclusions:

  • The choice between historical controls and randomization in phase II trials depends on specific trial circumstances.
  • Both approaches remain appropriate, with ongoing debate among investigators.
  • Careful statistical design is essential for maximizing the utility of phase II oncology trials.