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Can we learn anything from small trials?
1Department of Medicine, McMaster University, Hamilton, Ontario, Canada.
Abstract:
In summary, then, we can learn three useful things from small clinical trials. First, we can learn when to challenge conventional but untested therapeutic wisdom. Second, because the patient number in any trial is the number of events, rather than the number of study patients, some small trials are so definitively positive that they are sufficient to identify the best therapy. And third, small trials, even when individually inconclusive, can serve as the basis for convincingly conclusive overviews and meta-analyses that carry, and deserve, greater credibility than a single large trial of similar size to their sum.
Insights
Small clinical trials offer valuable insights, challenging conventional wisdom and identifying optimal therapies. They also provide robust data for meta-analyses, enhancing evidence credibility.
Area of Science:
- Clinical research methodology
- Evidence-based medicine
- Biostatistics
Background:
- The utility of small clinical trials in medical research is often underestimated.
- Conventional approaches may not always reflect the most effective therapeutic strategies.
Purpose of the Study:
- To highlight the significant contributions of small clinical trials to medical knowledge.
- To demonstrate how small trials can effectively challenge established therapeutic norms.
Main Methods:
- Analysis of the informational yield from small-scale clinical investigations.
- Evaluation of the statistical power derived from event-based patient counts in trials.
- Assessment of the role of small trials in synthesizing evidence through meta-analysis.
Main Results:
- Small trials can effectively question untested therapeutic conventions.
- Certain small trials provide definitive evidence for superior treatments based on event data.
- Individually inconclusive small trials contribute significantly to conclusive meta-analyses.
Conclusions:
- Small clinical trials are crucial for advancing therapeutic understanding and practice.
- The strategic use of small trials enhances the reliability and impact of medical evidence.
- Meta-analyses integrating data from multiple small trials offer robust and credible findings.