Neurocrine Biosciences to Present Wide-Ranging One-Year Data from Phase 3 CAHtalyst™ Pediatric Study at Pediatric Endocrine Society 2025 Annual Meeting

Core Insights - Neurocrine Biosciences announced significant findings from the Phase 3 CAHtalyst Pediatric study, demonstrating lasting reductions in glucocorticoid doses and improvements in clinical outcomes for pediatric patients with classic congenital adrenal hyperplasia (CAH) treated with CRENESSITY (crinecerfont) for up to one year [1][2][12] Group 1: Clinical Study Findings - The Phase 3 CAHtalyst Pediatric study included 103 pediatric patients aged 4 to 17 years, making it the largest interventional clinical trial program for classic CAH [2][10] - Patients receiving CRENESSITY showed a mean glucocorticoid dose reduction from 16.4 mg/m²/d at baseline to 13.5 mg/m²/d at Week 52, a decrease of 2.9 mg/m²/d [3] - Improvements in clinical outcomes included a reduction in mean body mass index (BMI) standard deviation scores by -0.09 in the CRENESSITY group compared to -0.02 in the placebo group [3] Group 2: Hormonal and Clinical Outcomes - Adrenocorticotropic hormone (ACTH), 17-hydroxyprogesterone (17-OHP), and androstenedione (A4) levels remained below baseline levels in patients treated with CRENESSITY, despite reduced glucocorticoid doses [1][4] - The proportion of patients achieving glucocorticoid doses within the physiologic range (≤11 mg/m²/d hydrocortisone equivalents) remained stable from Week 28 (30%) to Week 52 (32%) [4] Group 3: Safety and Tolerability - CRENESSITY was generally well tolerated, with no adrenal crises reported during the double-blind placebo-controlled (DBPC) period [5] - The most common adverse reactions included headache (25% vs. 6% for placebo), abdominal pain (13% vs. 0%), and fatigue (7% vs. 0%) [5] Group 4: Treatment Implications - CRENESSITY allows for a reduction in glucocorticoid doses while maintaining or improving hormonal levels, potentially transforming the treatment landscape for children and adolescents with classic CAH [2][14] - The study supports the ongoing use of CRENESSITY in conjunction with glucocorticoids for effective management of CAH [16]