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Related Concept Videos

Clinical Trials01:16

Clinical Trials

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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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Clinical Trials: Overview01:11

Clinical Trials: Overview

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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...
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Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches01:23

Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches

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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.
Non-controlled studies, commonly employed for initial exploration, lack a control group, rendering them susceptible to biases and external influences. In contrast,...
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Randomized Experiments01:13

Randomized Experiments

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

Bioequivalence Experimental Study Designs: Completely Randomized and Randomized Block Designs

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Body: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...
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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

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Body: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...
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Updated: Dec 10, 2025

A Clinical Trial Assessing the Safety, Efficacy, and Delivery of Olive-Oil-Based Three-Chamber Bags for Parenteral Nutrition
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Are Some Randomized Clinical Trials Impossible?

Jonathan J Rios1,2,3,4, B Stephens Richards4,5, David A Stevenson6

  • 1Center for Pediatric Bone Biology and Translational Research, Scottish Rite for Children.

Journal of Pediatric Orthopedics
|August 28, 2020
PubMed
Summary
This summary is machine-generated.

Recruiting for a rare pediatric bone condition like congenital tibial pseudarthrosis in neurofibromatosis type 1 (NF1) proved challenging. A complex randomized trial for bone morphogenetic protein (rhBMP-2) failed due to insufficient patient enrollment.

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Area of Science:

  • Orthopaedic Surgery
  • Genetics
  • Pediatric Oncology

Background:

  • Congenital tibial pseudarthrosis is a rare complication of neurofibromatosis type 1 (NF1).
  • Treatment for this condition is complex and requires specialized surgical intervention.
  • The efficacy of bone morphogenetic proteins in treating NF1-associated pseudarthrosis was under investigation.

Purpose of the Study:

  • To evaluate the effectiveness of recombinant human bone morphogenetic protein-2 (rhBMP-2) in patients with NF1 undergoing tibial surgery for congenital pseudarthrosis.
  • To conduct a randomized, placebo-controlled trial to assess rhBMP-2's impact on surgical outcomes.

Main Methods:

  • A randomized, placebo-controlled trial was designed involving 16 experienced centers.
  • The study involved standard surgical procedures including resection, intramedullary rodding, and autogenous bone grafting.
  • Patients were randomized to receive either rhBMP-2 or a placebo during surgery.

Main Results:

  • The study failed to enroll the required 54 patients over a 3-year period, with only 5 participants enrolled.
  • Due to critically low enrollment, the study was terminated prematurely in June 2019.
  • Significant obstacles in patient recruitment for this rare pediatric orthopaedic condition were encountered.

Conclusions:

  • Conducting randomized, placebo-controlled trials for rare pediatric orthopaedic conditions presents substantial recruitment challenges.
  • The study highlights the difficulties in investigating novel treatments for rare diseases within established clinical trial frameworks.
  • Recommendations are provided for future research on the orthopaedic manifestations of NF1.