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Clinical Trials

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...

Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches

Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches

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,...

Clinical Trials: Overview

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...

Blind Procedures

Blind Procedures

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...

Psychosurgery

Psychosurgery

Psychosurgery, the surgical alteration or permanent removal of brain tissue to alleviate severe psychological conditions, stands as one of the most radical and controversial treatments in the history of mental health care. Its development and application have evolved significantly, marked by dramatic shifts in scientific understanding and ethical perspectives.
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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.

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Related Experiment Video

Updated: May 3, 2026

Single-Port Robotic-assisted Transaxillary Breast-conserving Surgery: A Prospective, Single-arm, Non-randomized Phase IIa Clinical Trial

Single-Port Robotic-assisted Transaxillary Breast-conserving Surgery: A Prospective, Single-arm, Non-randomized Phase IIa Clinical Trial

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Insights into surgical trials: methodological challenges and solutions.

Colette Doerr-Harim¹, Thomas Bruckner, Markus K Diener

¹Study Center of the German Surgical Society, University of Heidelberg, Heidelberg, Germany.

Langenbeck'S Archives of Surgery

|January 18, 2014

Summary

Conducting high-quality surgical trials, particularly prospective randomized controlled trials, presents challenges. This study outlines common pitfalls and offers solutions based on 11 years of experience, demonstrating that valid surgical research is achievable.

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Area of Science:

Surgical research methodology
Clinical trial design
Evidence-based surgery

Background:

Historically, surgical innovations relied on expert consensus and observed success.
Surgical trials, especially Level 1b evidence, face scrutiny due to inherent complexities.
Over 11 years, Heidelberg University's general, visceral, and transplantation surgery unit identified challenges in surgical trials.

Purpose of the Study:

To identify and address critical aspects in planning surgical studies.
To outline common pitfalls encountered in surgical trials.
To propose practical solutions based on extensive trial experience.

Main Methods:

Review of prospective randomized controlled trials conducted over 11 years.
Analysis of challenges and successful strategies within a surgical clinical trial unit.
Experience-based identification of best practices for surgical study design.

Main Results:

Prospective randomized controlled trials in surgery are feasible despite challenges.
Specific pitfalls in surgical trial design and execution were identified.
Solutions and strategies for overcoming these challenges were developed.

Conclusions:

High-quality surgical research, including randomized controlled trials, is attainable.
Addressing identified challenges enhances the validity and reliability of surgical studies.
The experiences provide a roadmap for improving future surgical trial methodologies.