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A Phase 1/2 First-Time-in-Human, open-label, multicenter, dose escalation and expansion study of GSK5458514 PSMA targeting T cell engager alone or in combination with other anti-cancer agents in adult participants with metastatic castration-resistant prostate cancer (mCRPC)

Status
Recruiting
Phases
Phase 1Phase 2
Study type
Interventional
Source
EU CTIS
Registry ID
CTIS2025-521581-10-00
Acronym
223050
Enrollment
20
Registered
2025-11-03
Start date
2026-01-16
Completion date
Unknown
Last updated
2025-11-13

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Neoplasms, Prostate

Brief summary

Number of participants with dose limiting toxicities (DLTs) during DLT observation period, Number of participants with adverse events (AEs), serious adverse events (SAEs), by Severity, Number of participants with AEs leading to dose modifications

Detailed description

GSK5458514 PK parameters following IV dose administration, as data permit - Area under concentration from 0 to t (AUC 0‑t) of GSK5458514 - Maximum concentration (Cmax) of GSK5458514, Number of participants with Anti-drug antibodies (ADA) against GSK5458514, Titers of Anti-drug antibodies (ADA) against GSK5458514, Prostate-specific antigen decrease from baseline >=50% (PSA50) Response Rate, Objective Response Rate (ORR)

Interventions

None listed

Sponsors

Glaxosmithkline Research & Development Limited
Lead SponsorINDUSTRY

Eligibility

Sex/Gender
Male
Age
18 Years to No maximum

Design outcomes

Primary

MeasureTime frame
Number of participants with dose limiting toxicities (DLTs) during DLT observation period, Number of participants with adverse events (AEs), serious adverse events (SAEs), by Severity, Number of participants with AEs leading to dose modifications

Secondary

MeasureTime frame
GSK5458514 PK parameters following IV dose administration, as data permit - Area under concentration from 0 to t (AUC 0‑t) of GSK5458514 - Maximum concentration (Cmax) of GSK5458514, Number of participants with Anti-drug antibodies (ADA) against GSK5458514, Titers of Anti-drug antibodies (ADA) against GSK5458514, Prostate-specific antigen decrease from baseline >=50% (PSA50) Response Rate, Objective Response Rate (ORR)

Countries

France, Spain

Outcome results

None listed

Source: EU CTIS · Data processed: Feb 4, 2026