Clinical trial · Interventional
Factors Influencing Immunotherapy Response in dMMR/MSI-H Gastric/Gastroesophageal Junction Adenocarcinoma
Factors Influencing Immunotherapy Response in Mismatch Repair Deficiency (dMMR) / Microsatellite Instability-High (MSI-H) Gastric/Gastroesophageal Junction Adenocarcinoma
- Source
- ClinicalTrials.gov
- Retrieved
- Sep 8, 2026
- Layer
- normalized (units and labels harmonized; values unchanged)
- Run
- ING-CLINICALTRIALS-20260908-000001
Summary
Brief summary (as posted)
dMMR/MSI-H is a key molecular subtype of gastric cancer, found in 8-22% of cases. It is typically associated with older age, female sex, distal tumor location, and intestinal histology (Lauren classification). While this subtype predicts better survival in locally advanced disease, its prognostic role in metastatic settings is less clear. Notably, dMMR/MSI-H tumors are often resistant to conventional chemotherapy. Conversely, they demonstrate exceptional sensitivity to immunotherapy. This has led to effective strategies using immune checkpoint inhibitors, either alone or combined with chemotherapy, in both neoadjuvant and advanced disease settings. However, key challenges remain. Prospective data are largely from Western populations, leaving the efficacy in Asian patients-who bear a high disease burden-less defined. Furthermore, about half of dMMR/MSI-H patients exhibit primary or acquired resistance to immunotherapy. A deeper understanding of the tumor-immune dynamics during treatment is crucial to uncover resistance mechanisms and improve patient outcomes.
Conditions
Conditions (3)
Free-text conditions as registered, with the CancerIndex entity they were reconciled to and the match type.
| Condition (as posted) | Mapped entity | Match | Confidence |
|---|---|---|---|
| Gastric / Gastroesophageal Junction Adenocarcinoma | — | UNRESOLVED | — |
| Immunotherapy | — | UNRESOLVED | — |
| Mismatch Repair Deficient or MSI-High Solid Tumors | — | UNRESOLVED | — |
Interventions
Interventions (3)
| Intervention | Type | Mapped drug | Match |
|---|---|---|---|
| D2 radical gastrectomy | Procedure | — | UNRESOLVED |
| Immunotherapy | Drug | Immunotherapy | ALIAS |
| Induction chemotherapy | Drug | — | UNRESOLVED |
Design
Arms and outcomes
Arms (1)
- type
- EXPERIMENTAL
- label
- dMMR/MSI-H GC
- description
- Immunotherapy with induction chemotherapy
- interventionNames
- Drug: Immunotherapy
- Drug: Induction chemotherapy
- Procedure: D2 radical gastrectomy
Primary outcomes (1)
- measure
- Rate of pathological complete response
- timeFrame
- From the initiation of treatment to the date of surgery, an average of 14 weeks.
- description
- The proportion of subjects exhibiting no residual tumor cells in the surgical specimen and the absence of positive lymph nodes (i.e., a pathological stage of ypT0N0).
Secondary outcomes (5)
- measure
- Major Pathological Response Rate
Eligibility
Eligibility (as posted)
- Sex
- All
- Minimum age
- 18 Years
- Maximum age
- 85 Years
Show eligibility criteria text
Inclusion Criteria: * Male or female, aged 18 to 85 years. * Histologically confirmed gastric cancer or adenocarcinoma of the esophagogastric junction (only Siewert types II and III are included). * dMMR status confirmed by immunohistochemistry (IHC) or MSI-H status confirmed by PCR/NGS. * Tumor clinical staging meeting the following criteria: cT≥2, any N, M0, assessed by the investigator as potentially resectable and planned for preoperative treatment followed by surgery. * Willing to receive treatment with immune checkpoint inhibitors (including, but not limited to, various PD-1 inhibitors, PD-L1 inhibitors, CTLA-4 inhibitors, PD-1/CTLA-4 bispecific antibodies, etc.), which may be combined with or without standard chemotherapy regimens for gastric cancer. Exclusion Criteria: * Tumor histology other than adenocarcinoma, such as squamous cell carcinoma, neuroendocrine carcinoma, etc. * Presence of central nervous system metastases and/or leptomeningeal carcinomatosis. * Prior antitumor therapy directed at the current gastric cancer (excluding palliative gastrointestinal bypass surgery performed to relieve obstructive symptoms).
References
Publications (0)
Data not yet available