A Phase III Multi-center, Open-label, Sponsor-blinded, Randomized Study of AZD0901 Monotherapy Compared With Investigator's Choice of Therapy in Second- or Later-Line Adult Participants With Advanced/Metastatic Gastric or Gastroesophageal Junction Adenocarcinoma Expressing Claudin18.2 (CLARITY Gastric 01)

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

Trial Details

Sponsor: AstraZeneca (industry)

Phase: 3

Start date: March 4, 2024

Planned enrollment: 572

Trial ID: NCT06346392
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More trial details at ClinicalTrials.gov More info

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Investigational Drug AI Analysis

chevron Show for: AZD0901 (Sonesitatug vedotin, CMG901)

chevron Show for: Apatinib (Rivoceranib)

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Goal: Evaluate whether AZD0901 improves progression-free survival and overall survival versus investigator’s choice of therapy as second- or later-line treatment in advanced/metastatic gastric or gastroesophageal junction (GEJ) adenocarcinoma expressing Claudin 18.2, and concurrently assess the clinical performance of the Ventana CLDN18.2 assay as a companion diagnostic.

Patients: Adults (≥18 years) with histologically confirmed unresectable, locally advanced or metastatic gastric, GEJ, or distal esophageal adenocarcinoma that is Claudin 18.2–positive on archival (≤24 months) or fresh biopsy. Patients must have progressed after at least one prior systemic line containing a fluoropyrimidine and platinum, have measurable or evaluable disease by RECIST 1.1, ECOG 0–1, life expectancy ≥12 weeks, and adequate organ function. Key exclusions include HER2-positive disease, significant or unstable gastric bleeding/ulcer, active or recent CNS disease, clinically significant corneal disease, unresolved ≥Grade 2 toxicities, prior ADC with an MMAE payload or prior CLDN18.2-targeted therapies beyond naked antibodies, and recent thromboembolic events.

Design: Global, multicenter, open-label, sponsor-blinded, randomized Phase III trial with approximately 572 participants assigned to AZD0901 or investigator’s choice of therapy. The study includes biomarker-driven enrollment based on CLDN18.2 expression and incorporates blinded independent central review for efficacy assessments.

Treatments: Experimental: AZD0901 intravenous infusion (two dose levels were planned; enrollment to Arm 2 closed). AZD0901 (sonesitatug vedotin; formerly CMG901) is a Claudin 18.2–targeted antibody–drug conjugate that delivers the microtubule inhibitor MMAE via a cleavable linker; it also mediates Fc-dependent immune effector functions and bystander killing. In Phase 1 gastric/GEJ cohorts, confirmed objective response rate was about 28%–33% with median duration of response around 8 months and manageable but notable Grade ≥3 toxicities including neutropenia, anemia, and vomiting; randomized data are pending. Comparator: Investigator’s choice of regionally accepted regimens, including ramucirumab plus paclitaxel, paclitaxel, docetaxel, irinotecan, TAS-102, or apatinib, each representing standard second- or later-line options depending on regional availability and prior exposure.

Outcomes: Dual primary endpoints are progression-free survival in all randomized participants and overall survival in the subgroup treated in third line or later. Key secondary endpoints include overall survival in all randomized participants, PFS in third line or later, objective response rate and duration of response by BICR per RECIST 1.1, safety and tolerability, pharmacokinetics of AZD0901, total antibody and MMAE, and immunogenicity including ADA prevalence/incidence and titers.

Burden on patient: Moderate. Patients will undergo CLDN18.2 testing, which may require a fresh biopsy if recent archival tissue is not available. Imaging for PFS/ORR by central review will be on a regular schedule similar to standard-of-care follow-up. As an ADC study, there will be intravenous infusions on a repeating cycle, safety labs, ECGs, and focused ophthalmologic monitoring given exclusion of corneal disease. The protocol includes pharmacokinetic and immunogenicity sampling for AZD0901, total antibody, MMAE, and ADA, which adds extra blood draws beyond routine care. Travel burden aligns with typical chemotherapy schedules; overall intensity exceeds that of purely oral regimens but is comparable to other second-line IV therapies with added PK/ADA assessments.

Last updated: Oct 2025

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