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A novel clinical tool to classify facioscapulohumeral muscular dystrophy phenotypes

Ricci, G; Ruggiero, L; Vercelli, L; Sera, F; Nikolic, A; Govi, M; Mele, F; ... Tupler, R; + view all (2016) A novel clinical tool to classify facioscapulohumeral muscular dystrophy phenotypes. Journal of Neurology , 263 (6) pp. 1204-1214. 10.1007/s00415-016-8123-2. Green open access

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Abstract

Based on the 7-year experience of the Italian Clinical Network for FSHD, we revised the FSHD clinical form to describe, in a harmonized manner, the phenotypic spectrum observed in FSHD. The new Comprehensive Clinical Evaluation Form (CCEF) defines various clinical categories by the combination of different features. The inter-rater reproducibility of the CCEF was assessed between two examiners using kappa statistics by evaluating 56 subjects carrying the molecular marker used for FSHD diagnosis. The CCEF classifies: (1) subjects presenting facial and scapular girdle muscle weakness typical of FSHD (category A, subcategories A1–A3), (2) subjects with muscle weakness limited to scapular girdle or facial muscles (category B subcategories B1, B2), (3) asymptomatic/healthy subjects (category C, subcategories C1, C2), (4) subjects with myopathic phenotype presenting clinical features not consistent with FSHD canonical phenotype (D, subcategories D1, D2). The inter-rater reliability study showed an excellent concordance of the final four CCEF categories with a κ equal to 0.90; 95 % CI (0.71; 0.97). Absolute agreement was observed for categories C and D, an excellent agreement for categories A [κ = 0.88; 95 % CI (0.75; 1.00)], and a good agreement for categories B [κ = 0.79; 95 % CI (0.57; 1.00)]. The CCEF supports the harmonized phenotypic classification of patients and families. The categories outlined by the CCEF may assist diagnosis, genetic counseling and natural history studies. Furthermore, the CCEF categories could support selection of patients in randomized clinical trials. This precise categorization might also promote the search of genetic factor(s) contributing to the phenotypic spectrum of disease.

Type: Article
Title: A novel clinical tool to classify facioscapulohumeral muscular dystrophy phenotypes
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/s00415-016-8123-2
Publisher version: http://dx.doi.org/10.1007/s00415-016-8123-2
Language: English
Additional information: Copyright © The Author(s) 2016. Open Access: This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Keywords: FSHD; Clinical phenotype; Diagnostic criteria; Disease registry; Disease classification
UCL classification: UCL
URI: https://discovery-pp.ucl.ac.uk/id/eprint/1490244
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