A Study of Atezolizumab and Trastuzumab in Combination With Capecitabine and Oxaliplatin in Patients With HER2 Positive Locally Advanced Resectable Gastric Cancer of Adenocarcinoma of Gastroesophageal Junction

August 17, 2026 updated by: Hoffmann-La Roche

A Phase II, Randomized Study of Atezolizumab (Anti-PD-L1 Antibody) and Trastuzumab in Combination With Capecitabine and Oxaliplatin (Xelox) in Patients With HER2 Positive Locally Advanced Resectable Gastric Cancer of Adenocarcinoma of Gastroesophageal Junction (GEJ)

This is a phase II, multicenter, randomized, open-label study designed to evaluate the efficacy and safety of perioperative trastuzumab+XELOX with / without atezolizumab in participants eligible for surgery with locally advanced HER2-positive gastric cancer or adenocarcinoma of GEJ.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
42

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 2

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • China
      • Beijing, China, 100142
        • Beijing Cancer Hospital
      • Chengdu, China, 610041
        • West China Hospital, Sichuan University
      • Guangzhou, China, 510515
        • Nanfang Hospital, Southern Medical University
      • Harbin, China, 150081
        • Harbin Medical University Cancer Hospital
      • Shanghai, China, 200032
        • Zhongshan Hospital Fudan University
      • Shengyang, China, 110042
        • Liaoning Provincial Cancer Hospital
      • Shenyang, China, 110001
        • First Hospital of China Medical University
      • Tianjing, China, 300060
        • Tianjin Medical University Cancer Institute & Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years to 75 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Histologically confirmed gastric cancer or adenocarcinoma of GEJ
  • HER2-positive status defined as either IHC score of 3+ or IHC 2+ with amplification proven by in situ hybridization (ISH) as assessed by local review based on pretreatment endoscopic biopsies.
  • Clinical stage at presentation: cT3/T4a/T4b, or N+, M0 as determined by AJCC staging system, 8th edition
  • Availability of pretreatment tumor specimen for biomarker analysis by central lab
  • Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1
  • Life expectancy >= 12 weeks
  • Adequate hematologic and end-organ function
  • For female patients of childbearing potential, agreement (by patient) to remain abstinent (refrain from heterosexual intercourse) or to use highly effective form(s) of contraception during the treatment period and to continue its use for at least i) 5 months after the last dose of atezolizumab, ii) 7 months after the last dose of trastuzumab, or iii) 6 months after the last dose of capecitabine or oxaliplatin, whichever is longer.
  • For men: agreement to remain abstinent (refrain from heterosexual intercourse) or use a condom, and agreement to refrain from donating sperm

Exclusion Criteria:

  • Stage IV (metastatic) or unresectable gastric/GEJ cancer determined by investigators
  • Prior systemic therapy for treatment of gastric cancer
  • History of malignancy other than GC within 5 years prior to screening, with the exception of malignancies with a negligible risk of metastasis or death
  • Cardiopulmonary dysfunction
  • Dyspnea at rest
  • Active or history of autoimmune disease or immune deficiency with the following exceptions: (a) Patients with a history of autoimmune-mediated hypothyroidism who are on thyroid-replacement hormone are eligible for the study. (b) Patients with controlled Type 1 diabetes mellitus who are on an insulin regimen are eligible for the study. (c) Patients with eczema, psoriasis, lichen simplex chronicus, or vitiligo with dermatologic manifestations only are eligible for the study provided allof following conditions are met: (i) Rash must cover < 10% of body surface area (ii) Disease is well controlled at baseline and requires only low-potency topical corticosteroids (iii) No occurrence of acute exacerbations of the underlying condition requiring psoralen plus ultraviolet A radiation, methotrexate, retinoids, biologic agents, oral calcineurin inhibitors, or high-potency or oral corticosteroids within the previous 12 months
  • History of idiopathic pulmonary fibrosis, organizing pneumonia, drug-induced pneumonitis, idiopathic pneumonitis, or evidence of active pneumonitis on screening chest CT scan
  • Active tuberculosis
  • Patients with active hepatitis B
  • Patients with active hepatitis C

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Arm A: Atezolizumab plus Trastuzumab with XELOX (Capecitabine + Oxaliplatin)
Participants will receive atezolizumab + trastuzumab + XELOX (Capecitabine + Oxaliplatin) for 3 treatment cycles prior to surgery, each cycle is 3 weeks. Following surgery, patrticipants will receive 5 further cycles of this regimen.
Drug: Atezolizumab
Atezolizumab will be administered by IV infusion at a fixed dose of 1200 mg on Day 1 of each 21-day cycle for 3 cycles prior to surgery and 5 cycles after surgery.
Other Names:
  • Tecentriq
Drug: Trastuzumab
Trastuzumab will be administered as an 8 mg/kg IV loading dose and then 6 mg/kg IV on Day 1 of a 21-day cycle for 3 cycles before surgery, and administration will continue after surgery. The first administration of trastuzumab after surgery should also be given at the loading dose of 8 mg/kg.
Other Names:
  • Herceptin
Drug: Capecitabine
Capecitabine 1000 mg/m^2 will be administered twice orally on Days 1-14, repeated every 3 weeks.
Drug: Oxaliplatin
Oxaliplatin 130 mg/m^2 will be administered by IV on Day 1 of a 21-day cycle.
Active Comparator: Arm B: Trastuzumab with XELOX (Capecitabine + Oxaliplatin)
Participants will receive trastuzumab + XELOX (Capecitabine + Oxaliplatin) for 3 treatment cycles prior to surgery, each cycle is 3 weeks. Following surgery, participants will receive 5 further cycles of this regimen.
Drug: Trastuzumab
Trastuzumab will be administered as an 8 mg/kg IV loading dose and then 6 mg/kg IV on Day 1 of a 21-day cycle for 3 cycles before surgery, and administration will continue after surgery. The first administration of trastuzumab after surgery should also be given at the loading dose of 8 mg/kg.
Other Names:
  • Herceptin
Drug: Capecitabine
Capecitabine 1000 mg/m^2 will be administered twice orally on Days 1-14, repeated every 3 weeks.
Drug: Oxaliplatin
Oxaliplatin 130 mg/m^2 will be administered by IV on Day 1 of a 21-day cycle.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Pathological Complete Regression (pCR) Rate
Time Frame: Completion of neoadjuvant systemic therapy (up to approximately 16 months)
pCR is defined as no evidence of vital residual tumor cells on hematoxylin and eosin evaluation of the complete resected gastric/GEJ specimen and all sampled regional lymph nodes following completion of neoadjuvant systemic therapy (NAST), which will be reviewed by local pathologist..
Completion of neoadjuvant systemic therapy (up to approximately 16 months)

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Disease-Free Survival (DFS)
Time Frame: Surgery to first documented disease recurrence or death from any cause, whichever occurs first (up to approximately 52 months)
Disease-free survival (DFS), defined as the time from surgery to the first documented disease recurrence or death from any cause, whichever occurs first.
Surgery to first documented disease recurrence or death from any cause, whichever occurs first (up to approximately 52 months)
Major Pathologic Response (MPR)
Time Frame: Randomization up to approximately 16 months
Major pathologic response (MPR), defined as < 10% residual tumor per tumor bed based on evaluation of the resected primary esophagogastric specimen by a local pathologist.
Randomization up to approximately 16 months
Objective Response Rate (ORR)
Time Frame: Randomiation to CR or PR during neoadjuvant systemic therapy (up to approximately 16 months)
Objective response rate (ORR), defined as the proportion of patients with a complete response (CR) or partial response (PR) during NAST, as determined by the investigator according to RECIST v1.1.
Randomiation to CR or PR during neoadjuvant systemic therapy (up to approximately 16 months)
R0 Resection Rate
Time Frame: Surgery
R0 resection rate, defined as the proportion of patients with a microscopically margin-negative resection, in which no gross or microscopic tumor remains in the primary tumor bed and/or sampled regional lymph nodes based on evaluation by the local pathologist.
Surgery
Percentage of Participants With Adverse Events
Time Frame: Baseline through the end of study (approximately 52 months)
Baseline through the end of study (approximately 52 months)
Event-free Survival (EFS)
Time Frame: Randomization to the first documented disease recurrence, unequivocal tumor progression or death from any cause, whichever occurs first (up to approximately 52 months)
Event-free survival (EFS), defined as the time from randomization to the first documented disease recurrence, unequivocal tumor progression determined by the investigator according to RECIST v1.1, or death from any cause, whichever occurs first.
Randomization to the first documented disease recurrence, unequivocal tumor progression or death from any cause, whichever occurs first (up to approximately 52 months)
Overall Survival (OS)
Time Frame: Randomiation to death from any cause (up to approximately 52 months)
Overall survival (OS), defined as the time from randomization to death from any cause in all patients.
Randomiation to death from any cause (up to approximately 52 months)

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Hoffmann-La Roche

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Study Director: Clinical Trials, Hoffmann-La Roche

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
March 12, 2021

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
May 8, 2023

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
July 27, 2026

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
December 3, 2020

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
December 3, 2020

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
December 10, 2020

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
September 10, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 17, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
August 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • ML42058

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

For eligible studies, qualified researchers may request access to individual patient level clinical data. See Roche's commitment to transparency of clinical study information here: https://go.roche.com/data_sharing

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

Yes

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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