Shares in Inventiva SA (Paris:IVAA) fell about 18% after development partner Abbvie Inc. quit development of the inflammatory disease drug cedirogant following an unfavorable readout from a phase II toxicology study. The companies had worked on the asset together for about a decade. Inventiva emerged from Abbott in 2012, before the healthcare giant split in 2013 to form pharma specialist Abbvie and Abbott Laboratories, focused on medical devices.