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- At the highest dose level evaluated to date (Cohort 4, 0.128 mg/kg once daily), the mean change from baseline in annualized height velocity (AHV) was +1.52 cm/yr (p=0.02, n=11) and the responder rate was 64% in children 5 years and older1
- Infigratinib was well-tolerated with no serious adverse events (SAE) and no discontinuations due to adverse events (AE) including in Cohort 5 (dose: 0.25 mg/kg once daily) participants dosed to date, with a median duration of follow-up of 48.1 weeks; only a limited number of AEs were assessed as related to study drug and all were Grade 1, the lowest level
- Given infigratinib’s profile to date, and after discussions with regulators, BridgeBio has begun dosing children in Cohort 5 (dose: 0.25 mg/kg once daily)
- Infigratinib is the only known oral product candidate currently under clinical investigation for achondroplasia, with granted and filed patent applications expiring as late as 2041
PALO ALTO, Calif., July 26, 2022 (GLOBE NEWSWIRE) -- BridgeBio Pharma, Inc. (Nasdaq: BBIO) (BridgeBio), a commercial-stage biopharmaceutical company focused on genetic diseases and cancers, today announced positive interim results from PROPEL 2, a Phase 2 trial of the investigational therapy infigratinib in children with achondroplasia. Achondroplasia (ACH) is the most common cause of disproportionate short stature. Achondroplasia impacts health and can lead to medical complications such as obstructive sleep apnea, middle ear dysfunction, kyphosis, and spinal stenosis. Achondroplasia affects approximately 55,000 people in the United States (US) and Europe, including up to 13,000 children and adolescents with open growth plates. The condition is uniformly caused by an activating mutation in fibroblast growth factor receptor 3 (FGFR3). Infigratinib is an oral small molecule that inhibits FGFR3, therefore designed to target this well-described disease at its source.
At the highest dose level evaluated to date (0.128 mg/kg once daily), mean increase in annualized height velocity (AHV) was 1.52 cm/yr over baseline (p=0.02, n=11) for all follow-up data available at time of data cut in children 5 years of age and older. In this group, 64% were responders (defined with a strict criterion of an increase ≥25% in AHV from baseline) and the average percent change from baseline in AHV was 60%.
Earlier cohorts in PROPEL 2 did not achieve the target efficacious exposure as suggested by our preclinical data and no dose response was observed. An increase in AHV over baseline of 0.22 cm/yr (p=0.54, n=38) was observed across these earlier combined cohorts for children 5 years of age and older.
PROPEL 2 enrolled children as young as 3 years of age in the study. Consistent with other trials in the younger age population, both AHV and height Z-scores were analyzed to help control for greater variability in growth seen by age and sex in children 3 to
