Prospects for GlaxoSmithKline PLC’s Nucala in COPD look dim but not stamped out after a complete response letter from the US FDA, amid regulatory unease about the use of eosinophil count as a biomarker to guide treatment for this condition.
Nucala (mepolizumab) – a monoclonal antibody targeting interleukin-5 (IL-5) – was initially approved by the FDA in November 2015 as...








