Overview
The purpose of this study is to test the safety and tolerability of PMD-026 in patients with metastatic breast cancer. PMD-026 is a targeted oral agent designed to kill tumor cells in metastatic breast cancer.
Description
Combination with fulvestrant (Part 3):
This study will prospectively enroll RSK2+, HR+, and human epidermal growth factor receptor 2 negative (HER2-) patients to evaluate PMD-026 in combination with a standard dose and schedule of fulvestrant. Fulvestrant will be dosed per the package insert in combination with PMD-026 at the RP2D determined in the monotherapy phase of the study. Up to 20 patients will be enrolled with locally advanced or metastatic HR+/HER2- breast cancer previously treated with a CDK4/6 inhibitor in combination with endocrine therapy.
Eligibility
Inclusion Criteria, Combination with fulvestrant (Part 3):
- RSK2 positive from available archival or fresh tumor tissue (FFPE).
- Histologically or cytologically diagnosed HR+, HER2-
- Diagnosis of adenocarcinoma of the breast with evidence of either locally advanced disease not amendable to resection or radiation with curative intent or metastatic disease not amendable to curative therapy
- Must be appropriate candidates for endocrine therapy
- Previously received at least 1 line of endocrine therapy for MBC or had recurrence while on adjuvant endocrine therapy for locally advanced breast cancer
- Discontinued endocrine therapy at least 15 days prior to first dose of PMD-026
- At least 1 measurable target lesion as defined by RECIST v1.1
- Progression on or after treatment with a CDK4/6 inhibitor in combination with endocrine therapy inhibitor in the locally advanced or metastatic setting
- Adequate hematologic, hepatic, and renal function as assessed by laboratory parameters
- Toxicity related to prior therapy resolved to at least Grade 1 (alopecia excepted) or to at least Grade 2 with prior approval of the Medical Monitor
Exclusion Criteria, Combination with fulvestrant (Part 3):
- ≤14 days from prior chemotherapy, biological or investigational therapy
- Prior fulvestrant in the locally advanced or metastatic setting
- Presence of visceral crisis or uncontrolled visceral disease for which chemotherapy would be indicated
- Central nervous system metastases, unless appropriately treated and neurologically stable
- History of leptomeningeal metastases
- Active, uncontrolled bacterial, viral, or fungal infection(s) requiring systemic therapy
- Known hepatitis B or hepatitis C infection
- Known HIV-positive with CD4+ cell counts <350 cells/μL
- Known HIV-positive with a history of an AIDS-defining opportunistic infection
- History of clinically significant cardiovascular abnormalities, including QTcF interval >460 msec (using Fridericia's formula)