Postoperative Adjuvant Therapy for Stage II-III Gastric Cancer

Efficacy and Safety of Postoperative Adjuvant Therapy for Stage II-III Gastric Cancer: a Prospective, Observational Study

For patients with stage II-III gastric cancer after radical D2 resection and R0 resection, postoperative adjuvant therapy guided by ctDNA-MRD (MRD-GATE external cohort) was not inferior to the standard chemotherapy regimen (this cohort).

Study Overview

• Status: Active, not recruiting
• Conditions: Stage II-III Gastric Cancer
• Intervention / Treatment: Drug: Standard chemotherapy regimen

• Study Type: Observational
• Enrollment (Estimated): 197

Contacts and Locations

Study Locations

• China
  • Shandong
    • Jinan, Shandong, China, 250012
      • Qilu hospital of Shandong univertisy
    • Jinan, Shandong, China, 250012
      • Shandong Provincial Hospital Affiliated to Shandong First Medical University
    • Jinan, Shandong, China
      • Jinan Central Hospital,
    • Qingdao, Shandong, China, 266000
      • The Affiliated Hospital Of Qingdao University
    • Yantai, Shandong, China, 264000
      • Yantai Yuhuangding Hospital

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: N/A

• Sampling Method: Probability Sample

Study Population

D2 gastrectomy followed by R0 resection, and postoperative pathology confirmed stage II-III gastric cancer

Description

Inclusion Criteria:

1. Patients who have undergone D2 gastrectomy, achieved R0 resection, and are pathologically diagnosed with stage II-III gastric cancer.
2. No preoperative neoadjuvant or adjuvant therapy received.
3. Voluntary participation with signed informed consent, demonstrating good compliance and willingness to cooperate with follow-up procedures.
4. Age between 18-75 years, with no gender restrictions.
5. Eastern Cooperative Oncology Group (ECOG) performance status of 0-1.
6. Estimated survival of 6 months or more.
7. Baseline hematological and biochemical parameters within specified limits: a. Hemoglobin ≥ 80g/L. b. Absolute neutrophil count ≥ 1.5×10^9/L. c. Platelet count ≥ 100×10^9/L. d. Aspartate or alanine aminotransferase ≤ 2.5 times the upper limit of normal. e. Alkaline phosphatase ≤ 2.5 times the upper limit of normal. f. Thyroid-stimulating hormone (TSH) ≤ 1 times the upper limit of normal (if abnormal, T3 and T4 levels must be normal).

Exclusion Criteria:

1. Pregnant or lactating women, or women of childbearing potential with a positive pregnancy test at baseline.
2. Evidence of postoperative recurrence or metastasis.
3. Previous anti-tumor therapy, including chemotherapy, radiotherapy, or immunotherapy.
4. Positive resection margins identified in postoperative pathology.
5. History of other malignancies within the past five years, except certain skin cancers, superficial bladder cancer, in situ cervical or breast cancer.
6. Uncontrolled pleural effusion, pericardial effusion, or ascites.
7. Severe cardiovascular conditions such as symptomatic coronary artery disease, congestive heart failure (grade ≥ II), uncontrolled arrhythmias, or myocardial infarction within the last 12 months.
8. Uncontrolled infection, severe kidney disease, or other significant concurrent diseases.
9. Allergic reactions to study drugs.
10. Receipt of any anti-tumor therapy within 4 weeks prior to enrollment.
11. Administration of live attenuated vaccines within 4 weeks prior to the first study treatment dose or plans to receive such vaccines during the study period.
12. Positive HIV antibody, active hepatitis B or C (with specific viral load criteria).
13. Positive for COVID-19 nucleic acid or antigen test.
14. Other conditions deemed by the investigator to potentially affect patient safety or trial compliance, including serious illnesses requiring treatment, severe laboratory abnormalities, or other social or family reasons.

Study Plan

How is the study designed?

Number of groups / cohorts

1

Cohorts and Interventions

Group / Cohort	Intervention / Treatment
Standard chemotherapy regimen	Drug: Standard chemotherapy regimen; In terms of postoperative adjuvant treatment, treatment is based on the guideline standard treatment plan, which can be adjusted according to the doctor's experience.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
3-year Disease-Free Survival (DFS) rate	The 3-year DFS rate is defined as the percentage of patients who remain free of tumor recurrence or death within three years after surgery.	3-year after the last subject participating in

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Rate of De-escalation Treatment	The Rate of De-escalation Treatment is defined as the proportion of patients among a study population who receive a reduction in the intensity or scope of therapeutic interventions.	3-year after the last subject participating in
Disease-Free Survival (DFS)	Disease-Free Survival (DFS) is defined as the duration of time from the initiation of surgery until the recurrence of the disease or death from any cause, whichever comes first.	3-year after the last subject participating in
Cumulative Risk of Recurrence	The Cumulative Risk of Recurrence is defined as the cumulative probability or risk of disease recurrence over a specified period, considering the entire study population.	3-year after the last subject participating in
3-year Overall Survival (OS) Rate	3-year Overall Survival (OS) Rate is defined as the percentage of patients who are still alive three years after the initiation of a specific treatment, regardless of disease recurrence or progression.	3-year after the last subject participating in

Collaborators and Investigators

• Sponsor: Qilu Hospital of Shandong University
• Collaborators: The Affiliated Hospital of Qingdao University; Shandong Provincial Hospital; Jinan Central Hospital; Yantai Yuhuangding Hospital

Study record dates

Study Major Dates

• Study Start (Actual): January 1, 2024
• Primary Completion (Estimated): January 1, 2028
• Study Completion (Estimated): January 1, 2029

Study Registration Dates

• First Submitted: September 18, 2024
• First Submitted That Met QC Criteria: September 21, 2024
• First Posted (Actual): September 24, 2024

Study Record Updates

• Last Update Posted (Actual): May 5, 2026
• Last Update Submitted That Met QC Criteria: May 2, 2026
• Last Verified: September 1, 2025

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Neoplasms by Site; Neoplasms; Gastrointestinal Neoplasms; Digestive System Neoplasms; Digestive System Diseases; Gastrointestinal Diseases; Stomach Diseases; Stomach Neoplasms
• Other Study ID Numbers: MRD2

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No