AstraZeneca and MedImmune, its global biologics research and development arm, announced that tralokinumab, an anti-interleukin-13 (IL-13) human monoclonal antibody, did not meet its primary endpoint of a significant reduction in the annual asthma exacerbation rate (AAER) in the overall population of severe, uncontrolled asthma patients, compared with placebo in STRATOS 1, the first of two pivotal Phase III trials.

