Trial reportTrials2015
Generalizing boundaries for triangular designs, and efficacy estimation at extended follow-ups.
Trial report in Trials, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT01067443 (A Phase II Randomized, Parallel Arm, Open-labeled Clinical Trial to Assess the Safety and Efficacy of the Combination of Sodium Stibogluconate Plus Single Dose AmBisome®, Miltefosine Plus Single Dose AmBisome® and Miltefosine Alone for the Treatment of Primary Visceral Leishmaniasis in Eastern Africa), which is not on this map. Cited by 2 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
A Phase II Randomized, Parallel Arm, Open-labeled Clinical Trial to Assess the Safety and Efficacy of the Combination of Sodium Stibogluconate Plus Single Dose AmBisome®, Miltefosine Plus Single Dose AmBisome® and Miltefosine Alone for the Treatment of Primary Visceral Leishmaniasis in Eastern Africa
Who cites it
2 citing papers in PubMed, 2 citations in OpenAlex.
- A randomized trial of AmBisome monotherapy and AmBisome and miltefosine combination to treat visceral leishmaniasis in HIV co-infected patients in Ethiopia.PLoS neglected tropical diseases · 2019Trial
- Efficacy and Safety of AmBisome in Combination with Sodium Stibogluconate or Miltefosine and Miltefosine Monotherapy for African Visceral Leishmaniasis: Phase II Randomized Trial.PLoS neglected tropical diseases · 2016Trial
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
6 authors at 5 institutions in 4 countries.
Funding
Abstract
backgroundVisceral leishmaniasis (VL) is a parasitic disease transmitted by sandflies and is fatal if left untreated. Phase II trials of new treatment regimens for VL are primarily carried out to evaluate safety and efficacy, while pharmacokinetic data are also important to inform future combination treatment regimens. The efficacy of VL treatments is evaluated at two time points, initial cure, when treatment is completed and definitive cure, commonly 6 months post end of treatment, to allow for slow response to treatment and detection of relapses. This paper investigates a generalization of the triangular design to impose a minimum sample size for pharmacokinetic or other analyses, and methods to estimate efficacy at extended follow-up accounting for the sequential design and changes in cure status during extended follow-up.
methodsWe provided R functions that generalize the triangular design to impose a minimum sample size before allowing stopping for efficacy. For estimation of efficacy at a second, extended, follow-up time, the performance of a shrinkage estimator (SHE), a probability tree estimator (PTE) and the maximum likelihood estimator (MLE) for estimation was assessed by simulation.
resultsThe SHE and PTE are viable approaches to estimate an extended follow-up although the SHE performed better than the PTE: the bias and root mean square error were lower and coverage probabilities higher.
conclusionsGeneralization of the triangular design is simple to implement for adaptations to meet requirements for pharmacokinetic analyses. Using the simple MLE approach to estimate efficacy at extended follow-up will lead to biased results, generally over-estimating treatment success. The SHE is recommended in trials of two or more treatments. The PTE is an acceptable alternative for one-arm trials or where use of the SHE is not possible due to computational complexity.
trial registrationNCT01067443 , February 2010.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.