Clinical Study of Low-dose Interval Radiotherapy Combined With Tirelizumab and SOX Chemotherapy Neoadjuvant Therapy for Locally Advanced Gastric/Gastroesophageal Junction Adenocarcinoma

NCT06766578 | Recruiting Phase 2

• 1 other identifier: NO.2024-1047
• Study Type: interventional
• Target: 32
• Locations: 1 country
• Sites: 1

Brief Summary

To evaluate the initial efficacy and safety of neoadjuvant low-dose interval radiotherapy combined with tirelizumab and SOX chemotherapy in locally advanced gastric/gastroesophageal junction adenocarcinoma.

Conditions

Locally Advanced Gastric/Gastroesophageal Junction Adenocarcinoma

Outcome Measures

Primary Outcomes (1)

• Pathological complete response rate (pCR)

  Pathological complete response was defined as pT0N0M0

  From date of neoadjuvant therapy until the date of postoperative pathological assessment, assessed up to 16-18 weeks.

Secondary Outcomes (8)

• Major pathological response rate (MPR)

  From date of neoadjuvant therapy until the date of postoperative pathological assessment, assessed up to 16-18 weeks.

• Objective response rate (ORR)

  From date of neoadjuvant therapy until the date of surgery, assessed up to 15-17 weeks.

• R0 resection rate

  From date of neoadjuvant therapy until the date of postoperative pathological assessment, assessed up to 16-18 weeks.

• Treatment safety

  From date of neoadjuvant therapy until the date of 30 days post-surgery, assessed up to 19-21 weeks.

• Postoperative complications

  The first 30 days following surgery.

Study Arms (1)

treatment arm(5×3Gy radiotherapy, tirelizumab, oxaliplatin, S-1)

EXPERIMENTAL

Radiation: Neoadjuvant Therapy(5×3Gy radiotherapy); Drug: Neoadjuvant Therapy(tirelizumab, oxaliplatin, S-1); Procedure: Surgical treatment; Drug: Adjuvant therapy(SOX chemotherapy)

Interventions

Neoadjuvant Therapy(5×3Gy radiotherapy) RADIATION

Radiotherapy: 5×3Gy. The preoperative radiotherapy target was outlined by radiotherapy physicians according to the NCCN Guidelines for Gastric/esophagogastric Junction Tumor 2024 edition and the surgeon's opinions. The first and third cycles were 5×3Gy.

treatment arm(5×3Gy radiotherapy, tirelizumab, oxaliplatin, S-1)

Surgical treatment PROCEDURE

Surgical treatment is completed within 3-5 weeks after the end of neoadjuvant therapy.

treatment arm(5×3Gy radiotherapy, tirelizumab, oxaliplatin, S-1)

Neoadjuvant Therapy(tirelizumab, oxaliplatin, S-1) DRUG

The first and third cycles are 5×3Gy radiotherapy D1 to 5, intravenous administration for tirelizumab 200 mg D6, intravenous administration for oxaliplatin 130 mg/m2 D6, and oral administration twice a day for S-1 40 mg/m2 D6 to 19. The second and fourth cycles are intravenous administration for tirelizumab 200 mg D1, intravenous administration for oxaliplatin 130 mg/m2 D1, and oral administration twice a day for S-1 40 mg/m2 D1 to 14. Every treatment cycle is spaced 1 week apart.

treatment arm(5×3Gy radiotherapy, tirelizumab, oxaliplatin, S-1)

Adjuvant therapy(SOX chemotherapy) DRUG

Postoperative adjuvant therapy is 4 cycles of SOX chemotherapy.

treatment arm(5×3Gy radiotherapy, tirelizumab, oxaliplatin, S-1)

Eligibility Criteria

• Age: 18 Years - 75 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Patients voluntarily participated in the study and signed informed consent with good compliance and follow-up;
• Adenocarcinoma of the gastric/gastroesophageal junction confirmed by endoscopic pathology (tumor located in the lesser bend of the stomach other than pylorus or the gastroesophageal junction) (Note: Pathology in other hospitals must be consulted by our hospital);
• Patients with cT4N+M0 AJCC stage 8 combined with endoscopic, CT, MRI, or PETCT findings;
• Age ≥18 years, ≤75 years, male and female;
• ECOG PS score 0-1;
• Presence of measurable and/or unmeasurable lesions as defined by the efficacy evaluation criteria for solid tumors (Recist 1.1);
• Has not received any prior systemic antitumor therapy (including but not limited to systemic chemotherapy, radiotherapy, molecular targeted drug therapy, immunotherapy, biotherapy, topical therapy, or other investigational therapeutic drugs;
• The functions of vital organs meet the following requirements (no blood components and cell growth factors are allowed to be used 2 weeks before screening) : Neutrophil absolute count (ANC) ≥ 1.5×10 9/L; Platelets ≥100×10 9/L; Hemoglobin ≥9g/dL; Serum albumin ≥2.8g/dL; Total bilirubin ≤ 1.5 ×ULN, ALT, AST and/or AKP≤2.5 ×ULN; serum creatinine ≤1.5 ×ULN or creatinine clearance ≥60mL/min (calculated according to the Cockcroft-Gault formula); International standardized ratio (INR) and activated partial thrombin time (APTT) ≤1.5×ULN (INR can be screened in the expected treatment range of anticoagulants for stable doses of anticoagulants such as low molecular weight heparin or warfarin);
• Fertile female subjects shall perform a urine or serum pregnancy test within 72 hours prior to receiving the first study drug, prove negative, and be willing to use an effective method of contraception during the trial period up to 5 months after the last drug administration.Male subjects whose partner is a woman of reproductive age should use an effective method of contraception during the trial period and for 7 months after the last dose.

You may not qualify if:

• a history of surgery for gastric/esophagogastric junction tumors;
• Previous history of fistula caused by primary tumor invasion;
• Higher risk of gastrointestinal bleeding and perforation;
• Poor nutritional status, BMI less than 18.5kg/m2, or PG-SGA score ≥9;
• Major surgery or severe trauma within 4 weeks prior to first use of the study drug;
• Uncontrolled pleural effusion, pericardial effusion or ascites requiring repeated drainage;
• has received or is currently receiving any of the following previous treatments: anti-PD-1 or anti-PD-L1 antibody therapy, chemotherapy, radiotherapy, targeted therapy;
• Received any investigational drug within 4 weeks prior to first use of the investigational drug;
• subjects requiring systemic treatment with corticosteroids (\> 10mg prednisone equivalent daily dose) or other immunosuppressants within 2 weeks prior to initial use of the study drug, except for corticosteroids for esophageal/gastric local inflammation and for the prevention of allergy and nausea and vomiting.Other special circumstances, need to communicate with the bid. In the absence of active autoimmune disease, inhaled or topical steroids and adrenocorticosteroid replacement at doses \> 10mg/ d of prednisone efficacy are permitted;
• those who have received antitumor vaccine or have received live vaccine within 4 weeks prior to the first administration of the study drug;
• have any active autoimmune disease or a history of autoimmune disease (such as interstitial pulmonary inflammation, uveitis, enteritis, hepatitis, hypophysitis, vasculitis, myocarditis, nephritis, hyperthyroidism, hypothyroidism); Except patients with vitiligo or recovered asthma/allergy of the same age without any intervention as adults;Patients with autoimmune mediated hypothyroidism treated with stable doses of thyroid hormone replacement and type 1 diabetes treated with stable doses of insulin could be included;
• have a history of immunodeficiency, including HIV positive, or other acquired or congenital immunodeficiency diseases, or have a history of organ transplantation or allogeneic bone marrow transplantation;
• any condition requiring systemic treatment with corticosteroids (more than 10 mg/ day of prednisone or its equivalent) or other immunosuppressant treatment within 14 days prior to treatment (except local, ocular, intraarticular, intranasal and inhaled corticosteroids with minimal systemic uptake); Prophylactic short-term (≤7 days) use of corticosteroids (e.g., to prevent contrast allergy) or for the treatment of non-autoimmune conditions (e.g., delayed hypersensitivity due to allergen exposure);
• subjects with uncontrolled cardiac clinical symptoms or disease, such as (1) NYHA II or above heart failure (2) unstable angina pecina (3) myocardial infarction within 1 year (4) clinically significant ventricular arrhythmias or ventricular arrhythmias requiring clinical intervention;
• Severe infection (CTCAE \> level 2), such as severe pneumonia, bacteremia, and infectious complications requiring hospitalization, occurred within 4 weeks prior to initial use of the study drug; Chest imaging at baseline suggested active lung inflammation and signs and symptoms of infection requiring oral or intravenous antibiotic treatment within 2 weeks prior to enrollment, except for prophylactic antibiotic use;

Sponsors & Collaborators

• Shandong Provincial Hospital: lead

Study Sites (1)

Shandong Provincial Hospital

Jinan, Shandong, 250021, China

RECRUITING

MeSH Terms

Interventions

Oxaliplatin; S 1 (combination); Surgical Procedures, Operative

Intervention Hierarchy (Ancestors)

Coordination Complexes; Organic Chemicals

Central Study Contacts

Liang Shang

CONTACT

+8615866602157; docshang@163.com

Study Design

• Study Type: interventional
• Phase: phase 2
• Allocation: NA
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: SINGLE GROUP
• Sponsor Type: OTHER GOV
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Professor

Study Record Dates

• First Submitted: December 29, 2024
• First Posted: January 9, 2025
• Study Start: December 30, 2024
• Primary Completion (Estimated): December 31, 2027
• Study Completion (Estimated): December 31, 2027
• Last Updated: April 29, 2026

Record last verified: 2026-04

Locations

CN (1)