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Related Concept Videos

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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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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Bioavailability Study Design: Healthy Subjects Versus Patients01:15

Bioavailability Study Design: Healthy Subjects Versus Patients

239
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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Bioavailability Study Design: Single Versus Multiple Dose Studies01:11

Bioavailability Study Design: Single Versus Multiple Dose Studies

372
Bioavailability studies are essential for understanding how a drug is absorbed, distributed, metabolized, and excreted in the body. These studies assess the extent and rate at which the active pharmaceutical agent becomes available at the site of action. The design of bioavailability studies can involve single-dose or multiple-dose regimens, each with distinct advantages and limitations.Single-dose studies are the preferred approach due to their simplicity and reduced drug exposure for...
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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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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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High Risk of Incident-Persistent Human Papillomavirus Infection With 9-Valent Vaccine Types in Young Men With an HPV Infection.

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

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A seamless phase IIB/III adaptive outcome trial: design rationale and implementation challenges.

Y H Joshua Chen1, Richard Gesser2, Alain Luxembourg3

  • 1Merck & Co., Inc., Whitehouse Station, NJ, USA.

Clinical Trials (London, England)
|October 4, 2014
PubMed
Summary

A seamless adaptive trial design accelerated the development of the nine-valent human papillomavirus (HPV) vaccine, improving statistical efficiency and reducing time to market for this important cancer-preventing vaccine.

Keywords:
human papillomavirus vaccine

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Last Updated: Apr 23, 2026

A Clinical Trial Assessing the Safety, Efficacy, and Delivery of Olive-Oil-Based Three-Chamber Bags for Parenteral Nutrition
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Published on: September 20, 2019

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Area of Science:

  • Vaccinology
  • Clinical Trial Design
  • Oncology

Background:

  • The four-valent human papillomavirus (HPV) vaccine prevents HPV types 6, 11, 16, and 18-related cancers, accounting for 70% of cervical cancers.
  • A nine-valent HPV vaccine offers broader protection, covering approximately 90% of cervical cancers by including types 31, 33, 45, 52, and 58.

Purpose of the Study:

  • To discuss the design rationale and implementation challenges of a seamless Phase IIB/III adaptive outcome trial for the nine-valent HPV vaccine.
  • To focus on the adaptive features of the seamless Phase IIB/III design to expedite clinical development.

Main Methods:

  • A seamless Phase IIB/III trial enrolled approximately 15,000 women aged 16-26.
  • Part A (1240 subjects) evaluated three nine-valent HPV vaccine formulations against a four-valent HPV vaccine control.
  • Part B (13,400 subjects) further evaluated the selected nine-valent HPV vaccine formulation for immunogenicity, efficacy, and safety.

Main Results:

  • The seamless Phase IIB/III design was justified by existing data on the four-valent HPV vaccine and development goals for the nine-valent vaccine.
  • Subjects from Part A contributed significantly to overall follow-up, maximizing trial efficiency.
  • Implementation challenges included formulation selection, regulatory discussions, and assay changes for immunological endpoints.

Conclusions:

  • A seamless Phase IIB/III adaptive design was successfully implemented for the nine-valent HPV vaccine outcome study.
  • This adaptive design shortened the development timeline for the nine-valent HPV vaccine through improved statistical efficiency.