Safety and Efficacy Study to Evaluate Proellex in the Treatment of Premenopausal Women With Symptomatic Endometriosis

Inclusion Criteria: * Premenopausal women aged 18-48 inclusive * Endometriosis documented by laparoscopic or surgical assessment within the past ten (10) years * Clinical symptoms of endometriosis for at least the past three (3) months * Endometriosis symptoms * Must be sexually active unless sexually inactive for endometriosis-related dyspareunia * Must have a regular or steady menstrual cycle lasting from 24 to 36 days and a detectable ovulation during the baseline period using an ovulation monitoring kit (for timing of endometrial biopsy) * Other inclusion criteria may apply Exclusion Criteria: * Six (6) months or more without a menstrual period, or * Prior hysterectomy or * Prior bilateral oophorectomy * Diagnosis of osteopenia * Present history or condition that causes non-endometriosis-related dyspareunia * Presence of excessive bleeding or menorrhagia * Abnormal screening endometrial biopsy * Other exclusion criteria may apply