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A Phase 3, Double-blind, Randomized Study of Zolbetuximab in Combination with Pembrolizumab and Chemotherapy (CAPOX or mFOLFOX6) in First-line Treatment of Locally Advanced Unresectable or Metastatic Gastric or Gastroesophageal Junction Adenocarcinoma in Participants Whose Tumors are HER2-negative, Claudin (CLDN) 18.2-positive and Programmed Death-ligand 1 (PD-L1)-positive

Status
Recruiting
Phases
Phase 3
Study type
Interventional
Source
EU CTIS
Registry ID
CTIS2024-519773-19-00
Acronym
8951-CL-0305
Enrollment
201
Registered
2025-07-08
Start date
2025-07-31
Completion date
Unknown
Last updated
2026-01-26

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

Conditions

Gastroesophageal Junction Adenocarcinoma, Gastric Cancer, Gastric Adenocarcinoma

Brief summary

Overall Survival, defined as the time from the date of randomization until the documented date of death from any cause

Detailed description

Progression-free survival, defined as the time from the date of randomization until the date of radiologic disease progression (investigator-assessed per RECIST V1.1) or death from any cause, whichever is earlier, Objective response rate, defined as the proportion of participants who have a best overall response of complete response or partial response as investigator-assessed per RECIST V1.1, Duration of response, defined as the time from the date of the first response (complete response/partial response) until the date of disease progression as investigator-assessed per RECIST V1.1 or date of death from any cause, whichever is earlier, Safety and tolerability of zolbetuximab in combination with pembrolizumab and chemotherapy as evaluated by adverse events, electrocardiogram, vital signs, Eastern Cooperative Oncology Group performance status and safety laboratory assessments (NCI-CTCAE version 5.0), Serum concentrations of zolbetuximab: end of infusion concentrations and concentration immediately prior to dosing at multiple dosing, Measurement of frequency of antidrug antibody-positive participants

Interventions

DRUGOXALIPLATIN
DRUGKEYTRUDA 25 mg/mL concentrate for solution for infusion
DRUGFOLINIC ACID
DRUGCAPECITABINE
DRUGFLUOROURACIL

Sponsors

Astellas Pharma Global Development Inc.
Lead SponsorINDUSTRY

Eligibility

Sex/Gender
All
Age
18 Years to No maximum

Design outcomes

Primary

MeasureTime frame
Overall Survival, defined as the time from the date of randomization until the documented date of death from any cause

Secondary

MeasureTime frame
Progression-free survival, defined as the time from the date of randomization until the date of radiologic disease progression (investigator-assessed per RECIST V1.1) or death from any cause, whichever is earlier, Objective response rate, defined as the proportion of participants who have a best overall response of complete response or partial response as investigator-assessed per RECIST V1.1, Duration of response, defined as the time from the date of the first response (complete response/partial response) until the date of disease progression as investigator-assessed per RECIST V1.1 or date of death from any cause, whichever is earlier, Safety and tolerability of zolbetuximab in combination with pembrolizumab and chemotherapy as evaluated by adverse events, electrocardiogram, vital signs, Eastern Cooperative Oncology Group performance status and safety laboratory assessments (NCI-CTCAE version 5.0), Serum concentrations of zolbetuximab: end of infusion concentrations and concentration

Countries

Belgium, Czechia, France, Germany, Italy, Lithuania, Netherlands, Poland, Portugal, Romania, Spain

Outcome results

None listed

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