1. Clinical and neuroimaging findings in 33 patients with <scp>MCAP</scp> syndrome: A survey to evaluate relevant endpoints for future clinical trials
- Author
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Florence Petit, Fabienne Giuliano, Juliette Mazereeuw-Hautier, Marjolaine Willems, Christel Thauvin-Robinet, Patricia Blanchet, Laurence Faivre, Elodie Gautier, Anne-Claire Bursztejn, Renaud Touraine, Annick Toutain, Frederico Di Rocco, Maxime Luu, Patrick Edery, Arthur Sorlin, Jean-Luc Alessandri, Nicolas Chassaing, Alice Goldenberg, Christine Chiaverini, Fanny Morice-Picard, Aurore Garde, Stéphanie Arpin, Massimiliano Rossi, Marc Bardou, Claire Nicolas, Gilles Morin, Jenny Cornaton, Cyril Mignot, Christophe Philippe, V. Carmignac, Rodolphe Dard, Joelle Roume, Michèle Mathieu-Dramard, Philippe Khau Van Kien, Pierre Vabres, Didier Lacombe, Diane Doummar, Lucile Pinson, Christine Coubes, Laurent Guibaud, Olivia Boccara, Laboratoire Maladies Rares: Génétique et Métabolisme (Bordeaux) (U1211 INSERM/MRGM), and Université de Bordeaux (UB)-Groupe hospitalier Pellegrin-Institut National de la Santé et de la Recherche Médicale (INSERM)
- Subjects
Adult ,Male ,0301 basic medicine ,Pediatrics ,medicine.medical_specialty ,Cutis marmorata ,Adolescent ,Class I Phosphatidylinositol 3-Kinases ,Neuroimaging ,Context (language use) ,Skin Diseases, Vascular ,030105 genetics & heredity ,Cohort Studies ,Young Adult ,03 medical and health sciences ,Genetics ,Polymicrogyria ,medicine ,Humans ,PROS ,Abnormalities, Multiple ,Telangiectasis ,Megalencephaly ,Child ,MCAP syndrome ,Genetics (clinical) ,Chiari malformation ,Clinical Trials as Topic ,business.industry ,Macrocephaly ,PIK3CA ,medicine.disease ,Magnetic Resonance Imaging ,3. Good health ,Clinical trial ,030104 developmental biology ,Child, Preschool ,Postnatal macrocephaly ,Female ,medicine.symptom ,business ,[SDV.MHEP]Life Sciences [q-bio]/Human health and pathology ,Forecasting ,Ventriculomegaly - Abstract
Megalencephaly-CApillary malformation-Polymicrogyria (MCAP) syndrome results from somatic mosaic gain-of-function variants in PIK3CA. Main features are macrocephaly, somatic overgrowth, cutaneous vascular malformations, connective tissue dysplasia, neurodevelopmental delay, and brain anomalies. The objectives of this study were to describe the clinical and radiological features of MCAP, to suggest relevant clinical endpoints applicable in future trials of targeted drug therapy. Based on a French collaboration, we collected clinical features of 33 patients (21 females, 12 males, median age of 9.9 years) with MCAP carrying mosaic PIK3CA pathogenic variants. MRI images were reviewed for 21 patients. The main clinical features reported were macrocephaly at birth (20/31), postnatal macrocephaly (31/32), body/facial asymmetry (21/33), cutaneous capillary malformations (naevus flammeus 28/33, cutis marmorata 17/33). Intellectual disability was present in 15 patients. Among the MRI images reviewed, the neuroimaging findings were megalencephaly (20/21), thickening of corpus callosum (16/21), Chiari malformation (12/21), ventriculomegaly/hydrocephaly (10/21), cerebral asymmetry (6/21) and polymicrogyria (2/21). This study confirms the main known clinical features that defines MCAP syndrome. Taking into account the phenotypic heterogeneity in MCAP patients, in the context of emerging clinical trials, we suggest that patients should be evaluated based on the main neurocognitive expression on each patient.
- Published
- 2021
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