Stopped: Due to study design limitations, this study has been discontinued and will not proceed with the 2nd cohort as contemplated in the original protocol.
This is a Phase 2 open label study to evaluate the safety, tolerability, PK, and PD of multiple dose levels of SC administered ELX-02 in patients with cystinosis with nonsense mutation in at least one allele. Six patients will be enrolled in the trial. The study will comprise of the following periods for each patient: * A screening period of up to 6 weeks * A total treatment period of 4 weeks * A safety follow-up period of 4 weeks after the last treatment Each patient will receive three escalating doses as follows: * Treatment period 1: ELX-02 0.5 mg/kg SC daily for 7 days (total dose not to exceed 3.5 mg/kg for this week; the daily dose will be individualized to achieve the target weekly exposure of about 47.5 µg\*h/mL) * Treatment period 2: ELX-02 1.0 mg/kg SC daily for 7 days (total dose not to exceed 7.0 mg/kg for this week; the daily dose will be individualized to achieve the target weekly exposure of about 95 µg\*h/mL) * Treatment period 3: ELX-02 2.0 mg/kg SC daily for 14 days (total dose not to exceed 14 mg/kg for these two weeks; the daily dose will be individualized to achieve the target weekly exposure of about 190 µg\*h/mL)
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AEs associated with different dose levels of ELX-02
Timeframe: From the time of first dosing through the follow-up visit, an average of approximately 10 weeks
Area under the plasma concentration curve from time zero to 24 hours (AUC0-24h)
Timeframe: Day 1 of treatment periods 1, 2, and 3
Maximum observed plasma concentration (Cmax)
Timeframe: Day 1 of treatment periods 1, 2, and 3
Observed plasma concentration at 1 hour post dose (C1h)
Timeframe: Days 1, 2, 5, and 7 of treatment periods 1-2; Days 1, 2, 5, 7, 10, and 14 of treatment period 3
Amount of ELX-02 excreted in urine from 0 to 24 hours (Ae24h)
Timeframe: Day 1 of treatment periods 1, 2, and 3
Renal clearance on Day 1 (Ae24h/plasma AUC0-24h)
Timeframe: Day 1 of treatment periods 1, 2, and 3