The aim of this study is to identify the optimal dose for EP0062 as monotherapy and in combination with standard-of-care therapies to assess its Safety, Tolerability, Pharmacokinetics, and Efficacy in Patients with Relapsed Locally Advanced or Metastatic AR+/HER-2-/ER+ Breast Cancer
Women 18 years or older at the time of informed consent
Histologically proven diagnosis of breast cancer with evidence of metastatic or locally advanced breast adenocarcinoma as defined by the American Joint Committee on Cancer/Union for International Cancer Control/Tumour Node Metastases (AJCC/UICC TNM) staging classification (8th Ed, 2017) and where no conventional therapy is available or considered appropriate by the Investigator or is declined by the patient
Availability of archival tumour sample (formalin-fixed, paraffin-embedded block(s) or slides from a primary tumour or biopsy of a metastatic tumour lesion or lesions); in the absence of an archival tumour sample, or if only archival bone tissue is available, a fresh biopsy will need to be collected
Biopsy-proven AR+ and ER+ breast cancer
Any chemotherapy within 21 days prior to the first dose of study drug
Any non-chemotherapy investigational anti-cancer drug < 5 half-lives (28 days for biologics) or < 14 days for small-molecule therapeutics or if half-life is not known
Tamoxifen and aromatase inhibitors within 14 days prior to the first dose of study drug
Fulvestrant or other investigational Selective Estrogen Receptor Degraders (SERDs) within 21 days prior to first dose of study drug