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Some adaptive strategies for inadequate sample acquisition in veterans administration cooperative clinical trials
Abstract:
A major concern of any clinical trial is being able to recruit sufficient patients of the proper type so that reliable answers can be obtained for the hypotheses being tested. This article considers patient recruitment in seven VA cooperative studies and the adaptive strategies used for inadequate sample acquisition. These strategies are: (1) the re-evaluation of the required sample size; (2) the addition of new hospitals; (3) the replacement of poor recruiting hospitals; (4) the extension of the patient intake period; and (5) the modification of the patient exclusion-inclusion criteria. When there is no expectation of achieving the required sample size in a reasonable time, the study is terminated. Although each of the five strategies will increase the likelihood of successfully completing a study should a recruitment problem occur, preventing these problems from occurring should be a major concern during the planning of a study.
Insights
Clinical trial patient recruitment is crucial for reliable results. This study reviews adaptive strategies for inadequate sample acquisition in VA cooperative studies, emphasizing proactive planning to prevent recruitment issues.
Area of Science:
- Clinical Trials
- Medical Research Methodology
- Health Services Research
Background:
- Effective patient recruitment is essential for clinical trial success and reliable hypothesis testing.
- Inadequate sample acquisition poses a significant challenge in conducting clinical research.
- Veterans Affairs (VA) cooperative studies face unique recruitment hurdles.
Purpose of the Study:
- To examine patient recruitment challenges in seven VA cooperative studies.
- To identify and evaluate adaptive strategies employed to address insufficient patient enrollment.
- To underscore the importance of preventative measures in clinical trial planning.
Main Methods:
- Analysis of patient recruitment data from seven VA cooperative studies.
- Review of adaptive strategies implemented during trials with recruitment difficulties.
- Categorization of five key strategies for managing inadequate sample acquisition.
Main Results:
- Five adaptive strategies were identified: re-evaluating sample size, adding hospitals, replacing underperforming sites, extending enrollment periods, and modifying eligibility criteria.
- Study termination is considered when sample size goals are unlikely to be met.
- Each strategy aims to improve the probability of successful study completion.
Conclusions:
- Adaptive strategies can mitigate recruitment problems and increase the likelihood of completing clinical trials.
- Proactive planning and prevention of recruitment issues should be a primary focus during study design.
- Effective patient recruitment is fundamental to the validity and success of clinical research.