Conditions:  Metastatic Breast Carcinoma;  Stage IV Breast Cancer AJCC v6 and v7
Interventions:  Drug: Fulvestrant;  Other: Laboratory Biomarker Analysis;  Drug: Letrozole;  Drug: Palbociclib;  Biological: Pembrolizumab
Sponsors:  City of Hope Medical Center;  National Cancer Institute (NCI)
**RECRUITING NOW**
Interventions:  Drug: Fulvestrant;  Other: Laboratory Biomarker Analysis;  Drug: Letrozole;  Drug: Palbociclib;  Biological: Pembrolizumab
Sponsors:  City of Hope Medical Center;  National Cancer Institute (NCI)
**RECRUITING NOW**
Source: View full study details on ClinicalTrials.gov
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