Question · Q4 2025
Lili Nsongo asked about the rationale for stopping at the 15mg dose for the CF program given no safety signals, and if there's flexibility to increase dosing. She also inquired about the expectation of a bifurcated regulatory path for pediatric and adult OTC deficiency patient populations.
Answer
Joseph Payne, President and CEO, reiterated that 10mg showed early efficacy, and the 12-week study extends that duration, with flexibility to increase to 15mg if needed, also considering cost of goods. He confirmed a likely bifurcated regulatory path for OTC due to differing severity. Alan H. Cohen, Chief Medical Officer, added that the FDA has shown willingness to offer more flexibility for ultra-rare pediatric populations.
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