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Related Concept Videos

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
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Blinding01:11

Blinding

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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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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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Blind Procedures02:07

Blind Procedures

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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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Hazard Ratio01:12

Hazard Ratio

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The hazard ratio (HR) is a widely used measure in clinical trials to compare the risk of events, such as death or disease recurrence, between two groups over time. It reflects the ratio of hazard rates—the instantaneous risk of the event occurring—between a treatment group and a control group. This measure provides valuable insights into the relative effectiveness of a treatment by assessing how the risk of an event differs between the two groups.
For example, in a clinical trial...
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Updated: Jan 14, 2026

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Risk-stratified breast cancer screening - a protocol for a non-blinded randomised trial.

Line Hjøllund Pedersen1,2, Janne Bigaard1, Pia Rørbæk Kamstrup3,4

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Summary
This summary is machine-generated.

This study evaluates risk-stratified breast cancer screening using polygenic scores to personalize mammography intervals. Findings will guide future large-scale trials for safer, more efficient screening strategies.

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Area of Science:

  • Oncology
  • Genetics
  • Public Health

Background:

  • Breast cancer is a leading cause of cancer death in women.
  • Current biennial mammography screening for women aged 50-69 reduces mortality.
  • Risk-stratified screening may improve early detection and reduce unnecessary procedures for low-risk individuals.

Purpose of the Study:

  • To investigate the feasibility, acceptability, cost-efficiency, and safety of multifactorial risk-stratified breast cancer screening.
  • To assess the impact of personalized screening intervals based on individual risk, including polygenic scores.

Main Methods:

  • A randomized controlled trial involving at least 962 women aged 50-67.
  • Participants are randomized to standard screening or risk-stratified intervals.
  • Online data collection and follow-up using a co-designed tool; primary outcome is delayed mammography in low-risk women.

Main Results:

  • The primary outcome is the proportion of low-risk women delaying their mammogram by 800 days.
  • Secondary outcomes include quality of life, anxiety, and breast cancer worry.
  • Health economic analyses will be performed.

Conclusions:

  • The study's findings are expected to inform the design of larger risk-stratified screening trials.
  • This research aims to optimize breast cancer screening protocols.