Safety, Tolerability, Pharmacokinetics, and Efficacy of Acapatamab in Subjects With mCRPC

• Status: Recruiting
• Trial end date: 2025-12-05
• Target enrollment: 0
• Participant gender: Male

Summary

A phase 1 study evaluating the safety, tolerability, pharmacokinetics, and efficacy of prostate specific membrane antigen half-life extended bispecific T-cell engager acapatamab in subjects with metastatic castration-resistant prostate cancer, and to determine the maximum tolerated dose (MTD) or recommended phase 2 dose (RP2D).

• Phase: Phase 1
• Accepts Healthy Volunteers?: No

Details

• Lead Sponsor: Amgen
• Treatments: Etanercept; Immune Checkpoint Inhibitors; Pembrolizumab

Criteria

All Parts

Inclusion Criteria:

• Subject has provided informed consent prior to initiation of any study specific activities/procedures

• Subjects with histologically or cytologically confirmed mCRPC who are refractory to a novel antiandrogen therapy (abiraterone, enzalutamide, and/or apalutamide) and have failed at least 1 (but not more than 2) taxane regimens (or who are deemed medically unsuitable to be treated with a taxane regimen or have actively refused treatment with a taxane regimen). Progression on novel antiandrogen therapy may have occurred in the non-metastatic CRPC setting

• Subjects must have undergone bilateral orchiectomy or must be on continuous ADT with a gonadotropin releasing hormone (GnRH) agonist or antagonist

• Total serum testosterone
• Evidence of progressive disease, defined as 1 or more PCWG3 criteria:

• PSA level >/= 1 ng/mL that has increased on at least 2 successive occasions at least 1 week apart

• nodal or visceral progression as defined by RECIST 1.1 with PCGW3 modifications

• appearance of 2 or more new lesions in bone scan

• Eastern Cooperative Oncology Group (ECOG) performance status of 0 - 1

• Life expectancy >/= 6months

Exclusion Criteria:

• Any anticancer therapy or immunotherapy within 4 weeks of start of first dose, not including luteinizing hormone-releasing hormone agonist (LHRH)/GnRH analogue (agonist/antagonist). Subjects on a stable bisophosphonate or denosumab regimen for >/= 30 days prior to randomization are eligible

• Prior PSMA-targeted therapy (subjects on prior therapy may be eligible if discussed with Amgen medical monitor prior to enrollment)

• Central nervous system (CNS) metastases, leptomeningeal disease, or spinal cord compression

• Active autoimmune disease or any other diseases requiring immunosuppressive therapy while on study

• Needing chronic systemic corticosteroid therapy (prednisone > 10 mg per day or equivalent) or any other immunosuppressive therapies (including anti-tumor necrosis factor alpha [TNF alpha] therapies) unless stopped 7 days prior to start of first dose

• Myocardial infarction, unstable angina, cardiac arrhythmia requiring medication, and/or symptomatic congestive heart failure (New York Heart Association > class II) within 12 months of first dose of acapatamab

Part 2 only:

• Subjects on a prior PD-1 or PD-L1 inhibitor who experienced a Grade 3 or higher immune-related adverse event prior to first day of dosing

• History or evidence of interstitial lung disease or active, non-infectious pneumonitis

Part 3 only:

• Evidence of active tuberculosis on chest radiograph within 3 months prior to the first dose of investigational product

Part 6 only:

Subjects are excluded from this cohort if any of the following additional criteria apply:

• Subjects taking strong OAT3 inhibitors (eg, probenecid) or adjust the dosing to 1 mg PO QD.

• Subjects with latent or active tuberculosis at screening