A Phase 3, Randomized, Three-Cycle, Double-Blind, Placebo-Controlled Study to Evaluate Induction of Secretory Conversion of Endometrium and Withdrawal Bleeding for Secondary Amenorrhea

This study will be a Phase 3, randomized, three-cycle, double-blind, placebo-controlled, parallel group, multiple-dose design. The study design has four phases: Screening Period; Open-Label Estrogen-Priming Period (Run-In Period); Blinded Treatment Period; and Follow-Up. The Open Label Priming Period and Blinded Treatment Period cover a total of three 28-day cycles. Clinical evaluations will be performed at the following time points: Screening Period: • Screening Period (approximately 42 Days) Open-Label Estrogen Priming Period (Run In Period): * Visit 1 Baseline (Cycle 1, Day 1) * Telephone Interview (Cycle 1, Day 28 \[- 3 d to ±1d\]) Blinded Treatment Period: * Visit 2 Randomization (Cycle 2, Day 12 \[±2d\]) * Visit 3 Interim (Cycle 3, Day 12 \[±2d\]) * Visit 4 End of treatment (Cycle 3, Day 24 \[±1d\]) Follow-Up Period: * Visit 5 Follow-Up (Approximately 10 days after the last treatment) * Telephone Interview (Approximately 2-4 weeks after completion of progestin course) (Only applies to subjects receiving an approved progestin therapy for proliferative endometrium, as determined by biopsy.)