Release Date: February 25, 2025
For the complete transcript of the earnings call, please refer to the full earnings call transcript.
Q: Can you give us any color on when you would look to meet with the FDA regarding the 12 mg and 20 mg cohort readouts? Also, what do you think the bar is on fetal hemoglobin and VOC reduction now that there have been changes in the sickle cell space? A: We aim to complete the 12 mg and 20 mg cohorts before going back to the FDA to review the next steps. However, depending on the data, we might approach the agency earlier with the 12 mg cohort data. Regarding fetal hemoglobin, recent data suggests that even modest increases can significantly reduce VOCs. For example, a 1% increase in fetal hemoglobin can lead to a 4% to 8% reduction in VOCs. Once levels reach the mid-20% range, VOCs are nearly abolished. We plan to engage with the FDA on using fetal hemoglobin as a surrogate endpoint for future studies.
Q: Can you provide insight into the types of patients enrolling in the Pioneer trial, especially with the withdrawal of Oxbryta? A: The 10 patients enrolled so far come from both South Africa and the US and tend to be on the more severe side. We expect their baseline fetal hemoglobin to be lower than previous cohorts. We plan to release the full data set once available, and we remain on track to share data from the 12 mg cohort by mid-year.
Q: What is the process for advancing to the 20 mg cohort, and what will the DSMB evaluate? A: Once the 8th patient completes 30 days of dosing, the Data Monitoring Committee (DMC) will review the data. The DMC focuses primarily on safety and tolerability. They will also review fetal hemoglobin data and other hematological data, but the primary decision to progress to the 20 mg cohort will be based on safety and tolerability.
Q: What type of data should we expect mid-year and year-end, and will there be any early VOC event readouts? A: We will share baseline and end-of-study fetal hemoglobin levels, other biomarkers, and safety data. While we are tracking VOCs, the study's short duration makes it unlikely to see significant VOC reductions. We will provide descriptive data on VOCs, but the study is not focused on efficacy readouts for VOCs.
Q: Regarding the FSHD readout expected in March, what are the key takeaways, and is there interest in exploring FSHD with another program? A: The MDA presentation will focus on the primary endpoint, key secondary endpoints, and safety. We will publish a detailed manuscript later, including a broader array of secondary endpoints. While we do not plan to continue with Los Mapoma, other players in the FSHD field may be interested in the data for longer-term studies.
For the complete transcript of the earnings call, please refer to the full earnings call transcript.
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