A Phase 3, Open-label, Multicenter, Randomized Study of Xaluritamig vs Cabazitaxel or Second Androgen Receptor-Directed Therapy in Subjects With Metastatic Castration-Resistant Prostate Cancer Previously Treated With Chemotherapy

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Investigational drug late phase More information Active drug More information Moderate burden on patient More information

Trial Details

Sponsor: Amgen (industry)

Phase: 3

Start date: Dec. 9, 2024

Planned enrollment: 675

Trial ID: NCT06691984
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More trial details at ClinicalTrials.gov More info

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chevron Show for: Xaluritamig (AMG 509)

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Goal: Compare overall survival of xaluritamig versus investigator’s choice of cabazitaxel or a second androgen receptor–directed therapy (abiraterone or enzalutamide) in post-taxane metastatic castration-resistant prostate cancer (mCRPC).

Patients: Adults with histologically confirmed prostate adenocarcinoma and mCRPC, at least one measurable or bone lesion, evidence of progression per PCWG3 criteria, castrate testosterone levels while on continuous ADT or after orchiectomy, prior progression on at least one AR-directed therapy, and exactly one prior taxane in the mCRPC setting (docetaxel in mHSPC allowed in addition). ECOG 0–1 and adequate organ function required. Key exclusions include prior STEAP1-targeted therapy, recent anticancer therapy, recent PSMA-RLT (unless <2 cycles), recent radionuclide or palliative radiotherapy without recovery, active concurrent systemic anticancer therapies, and history of CNS metastases other than treated, asymptomatic, stable dural disease.

Design: Phase 3, open-label, multicenter, randomized trial with approximately 675 participants allocated to xaluritamig versus investigator’s choice of cabazitaxel or second AR-directed therapy. Primary purpose is treatment; analyses will compare survival and key efficacy and patient-reported endpoints between arms with blinded independent central review for radiographic endpoints.

Treatments: Xaluritamig (AMG 509) administered by intravenous infusion. Xaluritamig is an investigational, first-in-class bispecific T-cell–engaging antibody targeting STEAP1 on prostate cancer cells and CD3 on T cells, using an XmAb 2+1 format to enhance STEAP1 avidity with a reduced-effector Fc. In phase 1 mCRPC studies, xaluritamig demonstrated antitumor activity (approximate PSA50 49% overall; higher responses at target doses) with a safety profile notable for mostly early, manageable cytokine release syndrome mitigated by step-up dosing and premedication; a 1.5 mg target regimen was selected for further development. Comparator arm: cabazitaxel IV or a second AR-directed therapy (abiraterone or enzalutamide) given per standard dosing at investigator discretion.

Outcomes: Primary endpoint is overall survival. Key secondary endpoints include rPFS by PCWG3-modified RECIST v1.1 per blinded independent central review, objective response rate, duration of response, disease control rate, time to response, time to first symptomatic skeletal event, safety and tolerability (TEAEs), patient-reported outcomes (BPI-SF pain measures, FACT-P, EQ-5D-5L, PRO-CTCAE), PSA50 and PSA90 response rates, and pharmacokinetics and immunogenicity of xaluritamig (Cmax, Tmax, Cmin, AUC, accumulation, half-life, anti-drug antibodies). Assessments are planned for up to approximately 43 months.

Burden on patient: Moderate. Participants will require regular clinic visits for IV administration, especially early cycle monitoring for cytokine release syndrome with potential step-up dosing and premedications. Imaging for rPFS with BICR, serial PSA testing, frequent safety labs, and comprehensive PRO questionnaires add to visit time but are consistent with advanced mCRPC trials. The xaluritamig arm may include additional pharmacokinetic and immunogenicity blood draws, particularly in early cycles, increasing chair time and venipuncture frequency. Oral comparator options may lessen visit burden, whereas cabazitaxel involves infusion visits similar to xaluritamig. Travel demands are typical for phase 3 oncology studies, without mandated biopsies or highly intensive procedures reported.

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