Evidence map›Paper›PMID 33407688›Full record

ArticleOrphanet journal of rare diseases2021

Hierarchical Bayesian modelling of disease progression to inform clinical trial design in centronuclear myopathy.

Eve Fouarge, Arnaud Monseur, Bruno Boulanger, Mélanie Annoussamy, Andreea M Seferian, Silvana De Lucia, Charlotte Lilien, Leen Thielemans, Khazal Paradis, Belinda S Cowling and 4 more

Open access · goldAbstract read
In one paragraph

Article in Orphanet journal of rare diseases, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 14 papers.

0numbers the graph read from it
0cells of the map it votes in
14citing papers in PubMed
3.6field-weighted citation impact, top 6% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

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.

2 · The registry

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.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

14 citing papers in PubMed, 30 citations in OpenAlex.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

14 authors at 4 institutions in 3 countries.

Eve FouargeDivision of Child Neurology, Centre de Référence Des Maladies Neuromusculaires, Department of Paediatrics, University Hospital of Liège and University of Liège, Liège, Belgium.ORCID 0000-0002-3929-7599
Arnaud MonseurPharmalex Belgium, Mont-Saint-Guibert, Belgium.
Bruno BoulangerPharmalex Belgium, Mont-Saint-Guibert, Belgium.
Mélanie AnnoussamyInstitute I-Motion, Hôpital Armand Trousseau, Paris, France.
Andreea M SeferianInstitute I-Motion, Hôpital Armand Trousseau, Paris, France.
Silvana De LuciaInstitute I-Motion, Hôpital Armand Trousseau, Paris, France.
Charlotte LilienInstitute I-Motion, Hôpital Armand Trousseau, Paris, France.
Leen ThielemansDynacure, 67400, Illkirch, France.
Khazal ParadisParadis Consultancy SAS, 06570, Saint-Paul-de-Vence, France.
Belinda S CowlingDynacure, 67400, Illkirch, France.
Chris FreitagDynacure, 67400, Illkirch, France.
Bradley P CarlinPharmaLex US, Burlington, MA, USA.
Laurent ServaisDivision of Child Neurology, Centre de Référence Des Maladies Neuromusculaires, Department of Paediatrics, University Hospital of Liège and University of Liège, Liège, Belgium. Laurent.servais@paediatrics.ox.ac.uk.
NatHis-MTM Study Group
Sorbonne Université · FRUniversity of Liège · BEState Archives of Belgium · BEUniversity of Oxford · GB

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundCentronuclear myopathies are severe rare congenital diseases. The clinical variability and genetic heterogeneity of these myopathies result in major challenges in clinical trial design. Alternative strategies to large placebo-controlled trials that have been used in other rare diseases (e.g., the use of surrogate markers or of historical controls) have limitations that Bayesian statistics may address. Here we present a Bayesian model that uses each patient's own natural history study data to predict progression in the absence of treatment. This prospective multicentre natural history evaluated 4-year follow-up data from 59 patients carrying mutations in the MTM1 or DNM2 genes.

methodsOur approach focused on evaluation of forced expiratory volume in 1 s (FEV1) in 6- to 18-year-old children. A patient was defined as a responder if an improvement was observed after treatment and the predictive probability of such improvement in absence of intervention was less than 0.01. An FEV1 response was considered clinically relevant if it corresponded to an increase of more than 8%.

resultsThe key endpoint of a clinical trial using this model is the rate of response. The power of the study is based on the posterior probability that the rate of response observed is greater than the rate of response that would be observed in the absence of treatment predicted based on the individual patient's previous natural history. In order to appropriately control for Type 1 error, the threshold probability by which the difference in response rates exceeds zero was adapted to 91%, ensuring a 5% overall Type 1 error rate for the trial.

conclusionsBayesian statistical analysis of natural history data allowed us to reliably simulate the evolution of symptoms for individual patients over time and to probabilistically compare these simulated trajectories to actual observed post-treatment outcomes. The proposed model adequately predicted the natural evolution of patients over the duration of the study and will facilitate a sufficiently powerful trial design that can cope with the disease's rarity. Further research and ongoing dialog with regulatory authorities are needed to allow for more applications of Bayesian statistics in orphan disease research.

Indexed as

Myopathies, Structural, CongenitalAdolescentBayes TheoremChildClinical Trials as TopicDisease ProgressionHumansProspective StudiesBayesian analysisCentronuclear myopathyComplex innovative clinical trial designDisease progression modelNatural history data

Identifiers

PMID33407688
PMCPMC7789189
OpenAlexW3120427786

What OpenQuestion holds

Textmetadata
LicenceCC BY
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Registered trials

None linked

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.