Skip to main content

Box 15 Exemplars on reporting item 11c elements

From: The adaptive designs CONSORT extension (ACE) statement: a checklist with explanation and elaboration guideline for reporting randomised trials that use an adaptive design

Example 1. Inferentially seamless phase 2/3 AD
“The interim analysis was carried out by an independent statistician (from ClinResearch GmbH, Köln, Germany), who was the only person outside the Data Monitoring Committee (DMC) with access to the semi-blinded randomization (sic) codes (treatment groups identified by letters A to G). This statistician functioned independently of the investigators, the sponsor’s clinical trial team members and the team that produced statistical programming for the interim analysis (DATAMAP GmbH, Freiburg, Germany). The independent statistician was responsible for all analyses of efficacy and safety data for the interim analysis. The DMC was given semi-blinded results with treatment groups identified by the letters A to G, with separate decodes sealed in an envelope to be opened for decision-making. The personnel involved in the continuing clinical study were told which two doses had been selected, but study blinding remained in place and the results of the interim analysis were not communicated. No information on the effects of the indacaterol doses (including the two selected) was communicated outside the DMC.” [141]
Example 2. Bayesian inferentially seamless phase 2/3 AD with RAR
“An independent Data Monitoring Committee (DMC) external to Lilly provided oversight of the implementation of the adaptive algorithm and monitored study safety. The DMC fulfilled this role during the dose-finding portion, and continued monitoring after dose selection until an interim database lock at 52 weeks, at which time the study was unblinded to assess the primary objectives. Sites and patients continued to be blinded to the treatment allocation until the completion of the study. The DMC was not allowed to intervene with the design operations. A Lilly Internal Review Committee (IRC), independent of the study team, would meet if the DMC recommended the study to be modified. The role of the IRC was to make the final decision regarding the DMC’s recommendation. The external Statistical Analysis Center (SAC) performed all interim data analyses for the DMC, evaluated the decision rules and provided the randomization updates for the adaptive algorithm. The DMC chair and the lead SAC statistician reviewed these (interim) reports and were tasked to convene an unscheduled DMC meeting if an issue was identified with the algorithm or the decision point was triggered.” [93]
Example 3. Inferentially seamless phase 2/3 AD with treatment selection, SSR, and non-binding futility stopping
“Following the interim analysis of the data and the review of initial study hypotheses, the committee (IDMC) chairman will recommend in writing to the sponsor whether none, one or two regimen(s) of propranolol is (are) considered to be the ‘best’ (the most efficacious out of all regimens with a good safety profile) for further study in stage two of the design. The second ‘best’ regimen will only be chosen for further study along with the ‘best’ regimen if the first stage of the study suggests that recruitment in the second stage will be too compromised by the fact that 1 in 3 patients are assigned to placebo. The IDMC will not reveal the exact sample size increase in the recommendation letter in order to avoid potential sources of bias (only the independent statistician, the randomisation team and the IP suppliers will be informed of the actual sample size increase). Any safety concerns will also be raised in the IDMC recommendation letter. The chairman will ensure that the recommendations do not unnecessarily unblind the study. In the case where the sponsor decides to continue the study, the independent statistician will communicate to the randomisation team which regimen(s) is (are) to be carried forward.” [94] Extracted from supplementary material.