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This study analyzed the clinical characteristics of epilepsy and response to anti\u2010seizure medications (ASMs) in a multinational CFCS cohort. A caregiver survey provided data regarding seizure history, use of ASMs and other treatment approaches, adverse effects, caregiver perception of treatment response, and neurological disease burden impact among individuals with CFCS. Results from 138 survey responses were quantitatively analyzed in conjunction with molecular genetic results and neurological records. The disease burden impact of CFCS was higher among individuals with epilepsy (<jats:italic>n<\/jats:italic>\u2009=\u200974\/138), especially those with more severe seizure presentation. Oxcarbazepine, a sodium\u2010channel blocker, had the best seizure control profile with relatively infrequent adverse effects. The most commonly prescribed ASM, levetiracetam, demonstrated comparatively poor seizure control. ASM efficacy was generally similar for individuals with <jats:italic>BRAF<\/jats:italic> and <jats:italic>MAP2K1<\/jats:italic> gene variants. The high proportion of patients with CFCS who experienced poor seizure control despite use of multiple ASMs highlights a substantial unmet treatment need. Prospective study of ASM efficacy and clinical trials of therapies to attenuate RAS\u2010MAPK signaling may improve avenues for clinical management.<\/jats:p>","DOI":"10.1002\/ajmg.a.63428","type":"journal-article","created":{"date-parts":[[2023,10,13]],"date-time":"2023-10-13T01:45:19Z","timestamp":1697161519000},"page":"301-310","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Epilepsy in cardiofaciocutaneous syndrome: Clinical burden and response to anti\u2010seizure medication"],"prefix":"10.1002","volume":"194","author":[{"given":"Daniel L.","family":"Kenney\u2010Jung","sequence":"first","affiliation":[{"name":"Department of Pediatrics Duke University  Durham North Carolina USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Josue E.","family":"Collazo\u2010Lopez","sequence":"additional","affiliation":[{"name":"Department of Pediatrics University of Minnesota Medical School  Minneapolis 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