Please assess the completion status of the following clinical trial:

Trial Title: A Phase I, Multicenter, Open-Label, Multi-Part, Dose-escalation Study of RAD1901 in Postmenopausal Women With Advanced Estrogen Receptor Positive and HER2-Negative Breast Cancer

Study Design Characteristics:
- Allocation: None
- Intervention Model: SINGLE_GROUP
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: PHASE1
- Number of Arms: 1.0

Eligibility Criteria:
Key Inclusion Criteria:~1. Patients must be post-menopausal women, as defined in the protocol~2. 18 years or older~3. Patients with histological or cytological proven diagnosis of adenocarcinoma of the breast with evidence of either locally advanced, inoperable and/or metastatic disease~4. Part A, B, C: Patients must have received no more than 2 prior chemotherapeutic regimens and at least 6 months of prior endocrine therapy~5. Part D: Patients may have received up to 1 previous line of chemotherapy and must have previously received 2 or more lines of endocrine therapy for advanced/metastatic breast cancer as a single agent or in combination. Patients must have received fulvestrant as one of the previous lines of endocrine therapy and have had documented progression while on, or within 1 month after the end of, fulvestrant therapy for advanced/metastatic breast cancer. Patients must have received prior treatment with a CDK4/6 inhibitor~Note: This list is not complete. Further inclusion criteria is provided in the protocol synopsis.~Key Exclusion Criteria:~1. Prior anticancer or investigational drug treatment within the following windows:~   1. Tamoxifen therapy less than 14 days before first dose of study treatment~  2. Part A, B and C: Fulvestrant therapy less than 90 days before first dose of study treatment. Part D: Fulvestrant therapy less than 42 days before first dose of study treatment~  3. Any other anti-cancer endocrine therapy less than 14 days before first dose of study treatment~  4. Any chemotherapy less than 28 days before first dose of study~  5. Any investigational drug therapy less than 28 days or 3 half-lives (whichever is longer) prior to first dose of study treatment~2. Patients with untreated or symptomatic central nervous system (CNS) metastases~3. Patients with endometrial disorders, including evidence of endometrial hyperplasia, dysfunctional uterine bleeding or cysts~Note: This list is not complete. Further exclusion criteria is provided in the protocol synopsis.

- Gender: FEMALE
- Minimum Age: 18 Years
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- Elacestrant (Type: EXPERIMENTAL): Part A, Dose Escalation: Patients will be assigned sequentially to escalating doses of elacestrant.~Part B, Safety Expansion: Once the MTD has been identified and/or a RP2D has been selected, additional patients will be enrolled to further evaluate the safety, tolerability and preliminary efficacy of the RP2D.~Part C, Tablet Introduction: A cohort of patients will be enrolled to evaluate the safety, tolerability, and PK of a tablet dosage form at 400 mg QD.~Part D, Dose Expansion: A cohort of patients will be enrolled to evaluate the safety, tolerability, PK and preliminary anti-tumor effect of elacestrant in tablet dosage form at 400 mg QD PO in a group of patients with a more homogeneous prior treatment history

Based on this trial design, predict the completion outcome and termination type (if applicable).