Fortress Bio's Zycubo Receives FDA Approval for Rare Menkes Disease Treatment.

Tuesday, Jan 13, 2026 8:43 am ET1min read
FBIO--

Fortress Biotech's (FBIO) Zycubo (CUTX-101) copper replacement therapy has been approved by the US FDA for children with Menkes disease, a rare disorder affecting copper metabolism. The approval led to a 10% increase in the company's stock price in the premarket on Tuesday. Menkes disease is estimated to affect 1 in 50,000 newborns.

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