Study of SPR001 in Adults With Classic Congenital Adrenal Hyperplasia

A Phase 2, Multiple-Dose, Dose-Escalation Study to Evaluate the Safety and Efficacy of SPR001 in Adults With Classic Congenital Adrenal Hyperplasia (CAH)

This is a multicenter Phase 2, multiple dose, dose escalation study to evaluate the safety, pharmacokinetics (PK), pharmacodynamics (PD), and efficacy of SPR001 in adult patients with classic congenital adrenal hyperplasia (CAH).

This is a 6-week, multiple-dose, dose escalation study of SPR001 for the treatment of adults with classic CAH. After screening, eligible patients will be enrolled into a 6-week treatment period followed by a 4-week washout/safety follow-up period. It is initially planned that up to approximately 18 patients in 2 dose cohorts will be enrolled. Additional patients or dose groups may be considered based upon specific safety, PK/PD, and/or efficacy findings, or if an active dose has not yet been reached. SPR001 will be administered as an oral daily dose. Patients will undergo titration of SPR001 through three escalating dosage strengths at 2-week intervals. Patients will have overnight PK/PD assessments performed at baseline, which include an pre-dose overnight assessment and a post-dose overnight assessment for PK/PD following administration of the first dose. At the end of each 2-week dosing period, patients will return for single overnight visits for steady-state PK/PD assessments. A follow-up outpatient visit will occur 30 days after their last dose.

The first cohort of 9 patients will be administered SPR001 at dose strength of Dose A daily for 2 weeks, and escalating through Dose B per day for 2 weeks and Dose C per day for 2 weeks.

Cohort B will begin enrollment after Cohort A has been fully enrolled. Starting dose selection and the stepwise dosing paradigm for Cohort B will be determined by an interim review of safety and PK/PD data from from Cohort A.

Cohort C will begin enrollment after Cohort B has been fully enrolled. Starting dose selection and the stepwise dosing paradigm for Cohort C will be determined by an interim review of safety and PK/PD data from from Cohort A and B.

Incidence of treatment-emergent adverse events; changes from Baseline to End-of-study in clinical laboratory parameters, physical examination findings, vital signs, ECG parameters

To evaluate the pharmacokinetic (PK) parameter of maximum plasma concentration (Cmax) of SPR001 in patients with CAH

To evaluate the PK parameter of area under the concentration-time curve (AUC) of SPR001 in patients with CAH

Inclusion Criteria: Male and female patients age 18 or older. Documented diagnosis of classic CAH due to 21-hydroxylase deficiency Elevated 17-OHP at screening On a stable glucocorticoid replacement regimen for a minimum of 30 days Exclusion Criteria: Clinically significant unstable medical condition, illness, or chronic disease Clinically significant psychiatric disorder. Clinically significant abnormal laboratory finding or assessment History of bilateral adrenalectomy or hypopituitarism Pregnant or nursing females Use of any other investigational drug within 30 days Unable to understand and comply with the study procedures, understand the risks, and/or unwilling to provide written informed consent.