• Simona Balestrini, Daniela Chiarello, Maria Gogou, Katri Silvennoinen, Clinda Puvirajasinghe, Wendy D Jones, Philipp Reif, Karl Martin Klein, Felix Rosenow, Yvonne G Weber, Holger Lerche, Susanne Schubert-Bast, Ingo Borggraefe, Antonietta Coppola, Serena Troisi, Rikke S Møller, Antonella Riva, Pasquale Striano, Federico Zara, Cheryl Hemingway, Carla Marini, Anna Rosati, Davide Mei, Martino Montomoli, Renzo Guerrini, J Helen Cross, and Sanjay M Sisodiya.
• Department of Clinical and Experimental Epilepsy, UCL Queen Square Institute of Neurology, London, and Chalfont Centre for Epilepsy, Gerrard Cross, UK.
• J. Neurol. Neurosurg. Psychiatr. 2021 Oct 1; 92 (10): 104410521044-1052.

ObjectiveThe term 'precision medicine' describes a rational treatment strategy tailored to one person that reverses or modifies the disease pathophysiology. In epilepsy, single case and small cohort reports document nascent precision medicine strategies in specific genetic epilepsies. The aim of this multicentre observational study was to investigate the deeper complexity of precision medicine in epilepsy.MethodsA systematic survey of patients with epilepsy with a molecular genetic diagnosis was conducted in six tertiary epilepsy centres including children and adults. A standardised questionnaire was used for data collection, including genetic findings and impact on clinical and therapeutic management.ResultsWe included 293 patients with genetic epilepsies, 137 children and 156 adults, 162 females and 131 males. Treatment changes were undertaken because of the genetic findings in 94 patients (32%), including rational precision medicine treatment and/or a treatment change prompted by the genetic diagnosis, but not directly related to known pathophysiological mechanisms. There was a rational precision medicine treatment for 56 patients (19%), and this was tried in 33/56 (59%) and was successful (ie, >50% seizure reduction) in 10/33 (30%) patients. In 73/293 (25%) patients there was a treatment change prompted by the genetic diagnosis, but not directly related to known pathophysiological mechanisms, and this was successful in 24/73 (33%).SignificanceOur survey of clinical practice in specialised epilepsy centres shows high variability of clinical outcomes following the identification of a genetic cause for an epilepsy. Meaningful change in the treatment paradigm after genetic testing is not yet possible for many people with epilepsy. This systematic survey provides an overview of the current application of precision medicine in the epilepsies, and suggests the adoption of a more considered approach.© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY. Published by BMJ.

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