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Clinical and neuroimaging findings in 33 patients with MCAP syndrome: A survey to evaluate relevant endpoints for future clinical trials
Clinical Genetics ( IF 2.9 ) Pub Date : 2021-01-07 , DOI: 10.1111/cge.13918
Aurore Garde 1, 2 , Laurent Guibaud 3 , Alice Goldenberg 4 , Florence Petit 5 , Rodolphe Dard 6 , Joelle Roume 6 , Juliette Mazereeuw-Hautier 7 , Nicolas Chassaing 8 , Didier Lacombe 9 , Fanny Morice-Picard 9 , Annick Toutain 10 , Stéphanie Arpin 10 , Olivia Boccara 11 , Renaud Touraine 12 , Patricia Blanchet 13 , Christine Coubes 13 , Marjolaine Willems 13 , Lucile Pinson 13 , Philippe Khau Van Kien 14 , Christine Chiaverini 15 , Fabienne Giuliano 16 , Jean-Luc Alessandri 17 , Michèle Mathieu-Dramard 18 , Gilles Morin 18 , Anne-Claire Bursztejn 19 , Cyril Mignot 20 , Diane Doummar 21 , Frederico Di Rocco 22 , Jenny Cornaton 1 , Claire Nicolas 1 , Elodie Gautier 1 , Maxime Luu 23 , Marc Bardou 23 , Arthur Sorlin 1, 2, 24 , Christophe Philippe 2, 24 , Patrick Edery 25 , Massimiliano Rossi 25 , Virginie Carmignac 24, 26 , Christel Thauvin-Robinet 1, 2, 24 , Pierre Vabres 24, 26 , Laurence Faivre 1, 2, 26
Affiliation  

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.

中文翻译:

33 例 MCAP 综合征患者的临床和神经影像学发现:一项评估未来临床试验相关终点的调查

巨脑畸形-毛细血管畸形-多小脑回 (MCAP) 综合征是由PIK3CA的体细胞镶嵌功能获得性变异引起的。主要特征是大头畸形、躯体过度生长、皮肤血管畸形、结缔组织发育不良、神经发育迟缓和脑异常。本研究的目的是描述 MCAP 的临床和放射学特征,以提出适用于未来靶向药物治疗试验的相关临床终点。基于法国的合作,我们收集了 33 名携带马赛克PIK3CA的 MCAP 患者(21 名女性,12 名男性,中位年龄为 9.9 岁)的临床特征致病性变异。对 21 名患者的 MRI 图像进行了审查。报告的主要临床特征是出生时大头畸形(20/31)、出生后大头畸形(31/32)、身体/面部不对称(21/33)、皮肤毛细血管畸形(火红痣28/33、橘皮17/33)。15 名患者出现智力障碍。在审查的 MRI 图像中,神经影像学检查结果为巨脑畸形 (20/21)、胼胝体增厚 (16/21)、Chiari 畸形 (12/21)、脑室扩大/脑积水 (10/21)、脑不对称 (6/21) ) 和多小脑回 (2/21)。该研究证实了定义 MCAP 综合征的主要已知临床特征。考虑到 MCAP 患者的表型异质性,在新兴临床试验的背景下,
更新日期:2021-01-07
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