Pharma Focus Europe

Addex Strategic Partner Completes Enrollment in ADX71149 Epilepsy Phase 2 Study Part 1

Tuesday, February 07, 2023

Addex Therapeutics, a clinical-stage pharmaceutical company pioneering allosteric modulation-based drug discovery and development, today announced that enrollment into Part 1 of the Phase 2 clinical study of ADX71149 (JNJ-40411813) for the treatment of epilepsy has been completed. ADX71149 is a selective metabotropic glutamate type 2 (mGlu2) receptor positive allosteric modulator (PAM). The trial is being conducted by Janssen Pharmaceuticals, Inc., part of the Janssen Pharmaceutical Companies of Johnson & Johnson. Data from Part 1 will now be evaluated by an independent interim review committee (IRC) to ensure the study remains blinded. Based on the outcome of this review and recommendations from the IRC, Janssen will evaluate next steps for the program.

“The Phase 2 study evaluating ADX71149 in epilepsy continues to make progress and we are pleased our collaboration partner has completed enrollment into Part 1 of the study,” said Tim Dyer, CEO of Addex. “We look forward to the outcome of the IRC review and the next steps for the program which are expected around the end of Q1 2023.”

The multi-center Phase 2 study is designed to assess the efficacy, safety, tolerability and pharmacokinetics of adjunctive ADX71149 administration in epilepsy patients with focal onset seizures with suboptimal response to levetiracetam. The primary objective of the study is to evaluate the efficacy of ADX71149 in combination with levetiracetam using a time to seizure event endpoint. Part 1 of the study evaluated the acute efficacy of ADX71149 over 4 weeks. Patients who do not reach or exceed their monthly baseline seizure count in Part 1 will have the opportunity to continue double-blind treatment during Part 2, deemed the maintenance efficacy phase (8 weeks). Patients who complete Part 1 are eligible to enter the open-label extension period.

Glutamate mGlu2 Receptors and Epilepsy

Glutamate is the primary excitatory neurotransmitter in the brain and plays a key role in the initiation and spread of seizures. When activated, the mGlu2 receptor is believed to decrease the release of glutamate and consequently help to maintain neurotransmitter balance. In the presence of agonist-induced activation, positive allosteric modulation of mGlu2 receptors could result in the normalization of the excessive glutamate release seen during a seizure. There is still an urgent need for more effective treatments for epilepsy, with improved tolerability and safety. ADX71149 was described in the Eilat 15 conference summary review as a promising novel approach currently in development (Bialer et al., 2020. Epilepsia). Proof of concept data with ADX71149 and other mGlu2 PAMs in animal models of epilepsy have been published in peer-reviewed journals (Metcalf et al., 2017 and 2018. Epilepsia).

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