Amgen's Reticence On Parsabiv Complete Response Letter Revives Transparency Issue

But Amgen is in good company when it comes to companies that choose not to disclose the contents of complete response letters, data from the Pink Sheet's FDA Performance Tracker show. Merck especially holds such information close.

Amgen Inc.'s calcimimetic Parsabiv (etelcalcetide) is at least the 10th novel agent to receive a complete response letter from FDA this year, but it joined a smaller group as well: cases where the sponsor disclosed the existence but not the content of a CRL.

Amgen released the bare minimum of information about the Parsabiv CRL in an Aug. 24 press release. "Amgen is reviewing...

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