Cognitive and adaptive measurement endpoints for clinical trials in mucopolysaccharidoses types I, II, and III: A review of the literature

Darren Janzen, Kathleen A. Delaney, Elsa G. Shapiro

Research output: Contribution to journalReview articlepeer-review

18 Scopus citations


Sensitive, reliable measurement instruments are critical for the evaluation of disease progression and new treatments that affect the brain in the mucopolysaccharidoses (MPS). MPS I, II, and III have early onset clinical phenotypes that affect the brain during development and result in devastating cognitive decline and ultimately death without treatment. Comparisons of outcomes are hindered by diverse protocols and approaches to assessment including applicability to international trials necessary in rare diseases. We review both cognitive and adaptive measures with the goal of providing evidence to a Delphi panel to come to a consensus about recommendations for clinical trials for various age groups. The results of the consensus panel are reported in an accompanying article. The following data were gathered (from internet resources and from test manuals) for each measure and summarized in the discussion: reliability, validity, date and adequacy of normative data, applicability of the measure's metrics, cross cultural validity including translations and adaptations, feasibility in the MPS population, familiarity to sites, sensitivity to change, and interpretability. If, resulting from this consensus, standard protocols are used for both natural history and treatment studies, patients, their families, and health care providers will benefit from the ability to compare study outcomes.

Original languageEnglish (US)
Pages (from-to)57-69
Number of pages13
JournalMolecular Genetics and Metabolism
Issue number2
StatePublished - Jun 2017

Bibliographical note

Funding Information:
Financial support for this literature review and for the consensus conference was provided from Biomarin Pharmaceuticals , Genzyme Sanofi , Shire , Alexion , Armagen , Chiesi , Eloxx Pharmaceuticals , Esteve , Orchard Therapeutics , PTC Therapeutics , ReGenxBio , Sobi , Ultragenyx Pharmaceuticals , uniQure , Abeona Therapeutics , Amicus Therapeutics , Lysogene , Phoenix Nest .

Publisher Copyright:
© 2017 The Authors


  • Adaptive skills
  • Clinical trials
  • Mucopolysaccharidosis
  • Neurocognition


Dive into the research topics of 'Cognitive and adaptive measurement endpoints for clinical trials in mucopolysaccharidoses types I, II, and III: A review of the literature'. Together they form a unique fingerprint.

Cite this