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Disitamab Vedotin Combined With Sintilimab and Multimodal Radiotherapy for HER2-Positive Advanced Gastric Cancer After Second-Line Treatment Failure: A Prospective, Single-Arm Phase II Clinical Trial

NCT07490990 · Status: NOT_YET_RECRUITING · Phase: PHASE2 · Type: INTERVENTIONAL · Enrollment: 30

Last updated 2026-08-03

No results posted yet for this study

Summary

Patients with HER2-positive advanced gastric cancer who experience disease progression after standard first- and second-line therapies have limited subsequent treatment options. Disitamab vedotin, a novel anti-HER2 antibody-drug conjugate (ADC), has been approved in China for this patient population. Immune checkpoint inhibitors (ICIs) serve as a core therapeutic modality for advanced gastric cancer; however, treatment discontinuation often occurs due to disease progression or immune-related adverse events, which raises clinical demands for immunotherapy rechallenge. Preclinical and early clinical evidence suggests that disitamab vedotin may remodel the tumor immune microenvironment and generate synergistic anti-tumor activity with PD-1 blockade. Furthermore, multimodal radiotherapy combining low-dose radiotherapy (LDRT) and high-dose hypofractionated radiotherapy (HFRT) can enhance systemic anti-tumor immunity through tumor antigen release and remodeling of the tumor immune microenvironment.

This prospective, multicenter, interventional, single-arm phase II clinical study aims to evaluate the efficacy and safety of disitamab vedotin combined with sintilimab and multimodal radiotherapy in patients with HER2-positive advanced gastric cancer with progression following first- and second-line systemic therapy. Eligible participants will receive protocol-specified disitamab vedotin and sintilimab, followed by multimodal radiotherapy delivered to at least two independent lesions. The primary endpoint is progression-free survival (PFS) assessed according to RECIST v1.1. Secondary endpoints include overall survival (OS), objective response rate (ORR), disease control rate (DCR), and safety profile. Exploratory biomarker analyses will be conducted using matched tumor tissue and peripheral blood specimens. A total of 30 participants will be enrolled. This trial is conducted in accordance with the Declaration of Helsinki and relevant Chinese biomedical research regulations. All enrolled patients will provide written informed consent, and the study has obtained ethical approval from the Ethics Committee of West China Hospital, Sichuan University.

Conditions

  • HER2-positive Advanced Gastric Cancer or Gastroesophageal Junction Adenocarcinoma

Interventions

DRUG

Disitamab vedotin + Sintilimab + Multimodality radiotherapy

Patients receive disitamab vedotin (2.5 mg/kg intravenously every 2 weeks), sintilimab (200 mg intravenously every 2 weeks), combined with multimodal radiotherapy consisting of low-dose radiotherapy (2 Gy × 5 fractions) and hypofractionated radiotherapy (8 Gy × 3 fractions).

Sponsors & Collaborators

  • Jiangsu Taizhou People's Hospital

    collaborator OTHER

  • Chengdu First People's Hospital

    collaborator OTHER

  • West China Hospital

    lead OTHER

Study Design

Allocation
NA
Purpose
TREATMENT
Masking
NONE
Model
SINGLE_GROUP

Eligibility

Min Age
18 Years
Max Age
75 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2026-06-30
Primary Completion
2028-06-30
Completion
2028-12-31

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07490990 on ClinicalTrials.gov