Vertex reports interim ALYFTREK pancreatic-function data in young children with cystic fibrosis

Vertex Pharmaceuticals released interim findings from an ongoing study of ALYFTREK in children aged 2 to 5 with cystic fibrosis. Among 48 children in a PERT-discontinuation substudy, 18, or 37.5%, stopped pancreatic enzyme replacement therapy for a mean of 8.6 weeks; across the 66-child cohort, 50% were not receiving PERT at the data cut. Mean fecal elastase-1 rose by 110.2 μg/g to 239.7 μg/g, and 48.6% of children reached the study's pancreatic-function benchmark. Vertex shared the findings at NACFC in Atlanta, while ALYFTREK remains investigational for this age group.

The findings could support future expansion of ALYFTREK into younger cystic-fibrosis patients, but use in children aged 2 to 5 is not yet approved. The reported ability of some participants to stop PERT may strengthen the case for further regulatory and clinical development, although these are interim data.

  • 1The interim analysis covered 48 children in a PERT-discontinuation substudy and 66 children in the full enrolled cohort.
  • 218 children, equal to 37.5%, stopped PERT for a mean of 8.6 weeks at the interim analysis, while 7 others had stopped before entering the substudy.
  • 3Mean fecal elastase-1 reached 239.7 μg/g, an increase of 110.2 μg/g from baseline.
  • 4Across the 66-child cohort, 50% were not receiving PERT at the data cut.
  • 5ALYFTREK use in children aged 2 to 5 with cystic fibrosis remains investigational.

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