The purpose of this study is to (1) determine the minimum effective dose of abiraterone acetate that normalizes androstenedione levels in prepubertal children with CAH secondary to 21-hydroxylase deficiency (Phase 1 trial), and (2) assess the utility of abiraterone acetate in prepubertal children with CAH as adjunctive therapy to minimize excessive androgen secretion and allow more physiological glucocorticoid replacement (Phase 2 trial).

Intervention Study for Type 2 Diabetes.