US FDA Rejection Stings Nucala In COPD; New Study May Be Needed

Mepolizumab would be first drug for chronic obstructive pulmonary disorder to use eosinophil count as a biomarker, but FDA’s complete response letter says more clinical data are needed.

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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...

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