Japan’s Kyowa Kirin Co. Ltd. has stopped development of its adenosine A2a receptor antagonist, KW-6356, in Parkinson’s disease. Discovered internally by Kyowa Kirin, KW-6356  was studied in phase II trials in Japan for Parkinson’s disease, with results showing it was “potentially effective in relieving motor and non-motor symptoms both as a monotherapy and in combination with levodopa-containing therapy,” Kyowa said. However, development is now being discontinued after conducting an evaluation of the global regulatory landscape, development hurdles and potential timelines for market entry.