Bolstered hours earlier by FDA approval of the oral small-molecule Bruton's tyrosine kinase (BTK) inhibitor Calquence (acalabrutinib), Astrazeneca plc and its biologics research and development arm, Medimmune, quietly posted a miss for the phase III STRATOS 2 and TROPOS trials of tralokinumab, an anti-interleukin-13 (IL-13) immunoglobulin (IGE)-G4 monoclonal antibody, in severe, uncontrolled asthma.