Dose-Titration and Open-label Extension Study of SRP-4045 in Advanced Stage Duchenne Muscular Dystrophy (DMD) Patients

Adverse event (AE) was any untoward medical occurrence in a clinical trial participant, which does not necessarily have a causal relationship with the investigational drug. AEs also included abnormal physical examination findings (Physical examination were conducted per protocol and any clinically significant abnormal findings were recorded in medical history if pre-existing or addressed as an AE if new or worsening). TEAEs was defined as AEs that started, worsened, or became serious on or after the start of first infusion through 148 weeks. Number of participants with TEAEs were reported.

Laboratory parameters included serum chemistry (hepatic chemistry and renal chemistry), hematology, coagulation, and urinalysis. Number of participants with potentially clinically significant abnormal finding were reported as TEAEs. The Investigator determined whether abnormal assessment results were potentially clinically significant or not. Potentially clinical significance was defined as any variation in assessment results that had medical relevance resulting in an alteration in medical care.

Vital sign parameters included systolic blood pressure (SBP), diastolic blood pressure (DBP), heart rate (HR), and body temperature. Number of participants with at least one potentially clinically significant abnormal vital signs findings were reported as TEAEs. The Investigator determined whether abnormal assessment results were potentially clinically significant or not. Potential clinical significance was defined as any variation in assessment results that had medical relevance resulting in an alteration in medical care.

Twelve-lead ECGs were performed at a consistent time of day throughout the study. Electrocardiograms were performed only after the participant was in the supine position, resting, and quiet for a minimum of 15 minutes. The ECG was manually reviewed and interpreted by medically qualified personnel. Number of participants with potentially clinically significant abnormalities in ECG reported as TEAEs were presented here. The Investigator determined whether abnormal assessment results were potentially clinically significant or not.

Standard, 2-dimensional ECHOs were performed at a consistent time of day throughout the study.The ECHO was reviewed and interpreted by medically qualified personnel. Number of participants with potentially clinically significant abnormalities in ECHO were reported.

Maximum Concentration (Cmax) of casimersen in plasma was evaluated.

Time to reach maximum plasma concentration (Tmax) of casimersen was evaluated.

Area under the concentration-time curve from time zero to the last quantifiable concentration of casimersen in plasma were evaluated.

Area under concentration-time curve from time zero pre-dose to twenty-four hours post-dos of casimersen in plasma were evaluated.

Area under the concentration-time curve from time zero extrapolated to the infinity of casimersen in plasma was evaluated.

Volume of distribution was defined as the theoretical volume in which the total amount of drug would need to be uniformly distributed to produce the desired plasma concentration of a drug. Apparent volume of distribution at steady state of casimersen was evaluated.

T1/2 is the time measured for the plasma concentration of drug to decrease by one half. T1/2 of casimersen was evaluated.

Drug clearance is a quantitative measure of the rate at which a drug substance is removed from the blood. CL of casimersen was evaluated.

MRTinf = AUMCinf/AUCinf - T/2, where T was the infusion duration, and AUMCinf was the area under the first moment curve from time 0 extrapolated to infinite time, calculated using the linear/log trapezoidal method. MRTinf of casimersen was evaluated.

Renal clearance was calculated using the partial AUC0-24 from the non-compartmental analysis in plasma and AE0-24. AUC0-24 was defined as area under the plasma concentration-time curve, from time 0 to 24 hours after completion of dosing. AE0-24 was defined as total cumulative amount excreted from 0 to 24 hours. Summarized data of all urine collection intervals are reported.