Sample size for phase II trials
Allocating the Sample Size in Phase II and III Trials to Optimize Success Probability
... practice: phase II often absorbs less resources than phase ...the size of samples adopted in phase II is, on average, 10–15% of the total sample size of the two ...
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What inference for two-stage phase II trials?
... actual sample size was as ...actual sample size differed from the preplanned sample size the UMVUE did not perform worse than an estimator specifically developed for such a ...
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Design of Phase II cancer trials evaluating survival probabilities
... phase II cancer trials, is not an option as all disease may have been irradiated or removed during surgery or the tri- al may be done only in patients who have experienced a complete ...ficient ...
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Meta analysis of randomized phase II trials to inform subsequent phase III decisions
... inform Phase III decisions, and we show how to derive: (i) the probability that the intervention will be truly beneficial in a new trial, and (ii) the probability that, in a new trial with a given ...
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Sample Size for Biosimilar Trials: In Defense of Synthesis
... pivotal phase 3 clinical study to have an equivalence design, which means that the study objective is to demonstrate that one treatment is neither “worse than” nor “better than” the other by some “clinically ...
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Three-Stage Phase II Clinical Trials
... Design Flexibility Dealing with sequential designs is complicated. It may be difficult to achieve exactly the number of patients proscribed for each phase. However, it should be remembered that the validity of the ...
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Asymptotic Optimal Sample Sizes for Discovering a Promising Treatment in Phase II Group Sequential Clinical Trials
... optimal sample size for each separate study in the setting discussed in Yao, Begg, and Livingston ...optimal sample size computation in the original setting and for individual one-stage, ...
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Advanced Designs of Cancer Phase I and Phase II Clinical Trials
... optimal sample size. In the other word, during the process of pursuing an optimal or minimal sample size, it may sacrifice the capability to detect or filter out the confounding results. ...
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Dose-finding designs for Phase II clinical trials
... lead-in phase with equal number of assignments to all doses. Such lead-in phase ensures that all doses are tested and provides data for initial estimation of the ...total sample size of 162, ...
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Sequential Design of Phase II-III Cancer Trials
... overall sample size of the study can be ...single-arm phase II cancer trials, they cannot commit the resources needed for “comparative controlled trials, or phase III ...
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A Sample Size Calculation of Bayesian Design for Superiority Trials with Rare Events
... [6], phase III clinical trial to evaluate the efficacy of an antiretroviral (ARV) intensification strategy to reduce the risk of transmission of HIV from mother to infant during labor and ...perinatal ...
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Optimal Two-stage designs in Phase-II Clinical Trials.
... type II error ...type II error probabilities that were as close as possible to α and β, respectively, without exceeding ...expected sample size at π = π 0 subject to the type I and type ...
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Statistical Considerations for Phase II Trials
... Randomized phase II clinical ...for phase II clinical ...Clin Trials. 1989 Mar;10(1):1-10. Storer BE. A sequential phase II/III trial for binary ...
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Practical guide to sample size calculations: superiority trials
... Abstract A sample size justification is a vital part of any investigation. However, estimating the number of participants required to give meaningful results is not always as straightforward. A number of ...
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Sample size calculation in multi-centre clinical trials
... tive sample size reestimation procedure could account for this problem as it has been applied for cluster ran- domized trials and the fixed effects multi-centre trial design ...of sample ...
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Sample Size Calculation of Clinical Trials with Correlated Outcomes
... randomized trials with count outcomes, we have proposed a sample size approach, which, compared to existing methods [ 3 , 60 ], is advantageous in its flexibility to incorporate pragmatic features, ...
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Sample Size Justifications for Pilot Trials of Publicly Funded Randomised Controlled Trials
... overall sample sizes than any of the other methods (Section ...required sample size in such situations an investigator may choose to use the larger sample size to be more sure of ...
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Endpoint Selection in Phase II Oncology trials
... • Response rate (RR) is the most frequent primary endpoint in Phase II oncology trials (preliminary results).. Response (RR) = Complete Response + Partial Response.[r] ...
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Sample size recalculation in three-arm non-inferiority trials
... the sample size estimation. In addition, the conventional fixed sample design may not be efficient as the recruitment of patients usually takes a period of time and the data become available steadily ...
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Approaches to sample size calculation for clinical trials in rare diseases
... decision-theoretic approach and hence, we assume that every patient of a target population of size N is treated either in the trial or afterwards outside the trial with the recommended treatment. The primary ...
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