DUBLIN – Shares in AC Immune SA were off more than 40% Sept. 23 on news that its tau-directed antibody, semorinemab, which is partnered with Genentech, failed to demonstrate efficacy in a phase II trial in Alzheimer’s disease.

Shares of Vaccinex Inc. fell to an all-time low on Sept. 22 after top-line results of the phase II trial, Signal, found its SEMA4D inhibitor, pepinemab, failed to improve measures of cognition in people with early manifest Huntington's disease following 18 months of treatment.

Shares of Marinus Pharmaceuticals Inc. climbed 51.7% to close at $3.20 on Sept. 15 following news that the company's sole clinical asset, ganaxolone, met the primary endpoint of its phase III Marigold study in CDKL5 deficiency disorder, a rare genetic condition that can leave children unable to walk, talk or feed themselves.

In brain research, neurons have long been the stars of the show. But that status is in part because they are flashiest.

Click Therapeutics Inc. and Boehringer Ingelheim GmbH inked a deal valued at more than $500 million to collaborate on the development and commercialization of a prescription-based digital therapeutic for schizophrenia. The mobile application, currently called CT-155, uses cognitive and neurobehavioral techniques to reduce the symptoms of schizophrenia, such as cognitive deficits and impaired social functioning.

Investors clipped shares of Avadel Pharmaceuticals plc recently as anxieties rose over the application by Jazz Pharmaceuticals plc for a patent that relates to a once-nightly oxybate product that could threaten the prospects for Avadel’s FT-218.

In a relatively light news flow for the group last month, the gainers and decliners in the BioWorld Neurological Diseases index canceled themselves out during August, with the result that the price-weighted index closed relatively flat and, despite briefly moving into positive territory in July, its value is down 4% for the year.