To secure mortality benefit labeling language for its chronic obstructive pulmonary disease drug Trelegy Ellipta, GlaxoSmithKline plc will have to overcome US Food and Drug Administration skepticism about the design and results of the IMPACT trial, including questions as to whether the survival benefit seen was driven by the abrupt withdrawal of inhaled corticosteroid treatment for some randomized subjects.
In a briefing document released ahead of a 31 August advisory committee meeting, the agency cites “statistical and clinical...