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ctDNA-Guided Immunotherapy for dMMR/MSI-H Colon Cancer

24 septembre 2026 mis à jour par: Junjie Peng, Fudan University

A Single-Arm Phase II Study of Circulating Tumor DNA-Guided Neoadjuvant Immunotherapy for dMMR/MSI-H Colon Cancer

This prospective, multicenter, single-arm phase II interventional study evaluates whether longitudinal circulating tumor DNA (ctDNA) monitoring can guide neoadjuvant immunotherapy and surgical decision-making in dMMR/MSI-H colon cancer. Participants with ctDNA clearance proceed to curative surgery, whereas those with persistent ctDNA positivity escalate to combined PD-1 and CTLA-4 inhibitor therapy.

Aperçu de l'étude

Statut

Recrutement

Les conditions

Intervention / Traitement

Description détaillée

This prospective, multicenter, single-arm phase II study evaluates the clinical utility of longitudinal circulating tumor DNA (ctDNA) monitoring to guide neoadjuvant immunotherapy and surgical decision-making in patients with dMMR/MSI-H colon cancer.

Eligible participants will initially receive neoadjuvant PD-1 inhibitor monotherapy. Peripheral-blood ctDNA will be assessed at baseline and after 3 to 4 treatment cycles. Participants with ctDNA clearance will proceed to curative surgery. Participants with persistent ctDNA positivity will be considered to have potential resistance to PD-1 inhibitor monotherapy and will escalate to combined PD-1 and CTLA-4 inhibitor therapy. ctDNA will be reassessed every 2 cycles during combination therapy. Participants will undergo curative surgery after ctDNA clearance or after no more than 4 cycles of combination treatment, regardless of final ctDNA status.

All participants will undergo postoperative ctDNA/minimal residual disease (MRD) testing 1 month after surgery. The study will evaluate pathological response, survival outcomes, the concordance of ctDNA with pathological and imaging assessments, and treatment- and surgery-related safety.

Type d'étude

Interventionnel

Inscription (Estimé)

23

Phase

  • Phase 2

Contacts et emplacements

Cette section fournit les coordonnées de ceux qui mènent l'étude et des informations sur le lieu où cette étude est menée.

Coordonnées de l'étude

  • Nom: Junjie Peng, MD, PhD
  • Numéro de téléphone: 86-18017317122
  • E-mail: pengjj@shca.org.cn

Sauvegarde des contacts de l'étude

Lieux d'étude

  • Chine
      • Shanghai, Chine, 200000
        • Recrutement
        • Fudan University Shanghai Cancer Center
        • Contact:

Critères de participation

Les chercheurs recherchent des personnes qui correspondent à une certaine description, appelée critères d'éligibilité. Certains exemples de ces critères sont l'état de santé général d'une personne ou des traitements antérieurs.

Critère d'éligibilité

Âges éligibles pour étudier

18 ans à 75 ans (Adulte, Adulte plus âgé)

Accepte les volontaires sains

Non

Sexes éligibles pour l'étude

Tout

La description

Inclusion Criteria:

  • Written informed consent obtained before any study-related procedures.
  • Age 18 to 75 years, inclusive.
  • Histologically confirmed colon adenocarcinoma, mucinous adenocarcinoma, or signet-ring cell carcinoma, with the tumor located at least 15 cm from the anal verge.
  • dMMR/MSI-H status confirmed by immunohistochemistry, polymerase chain reaction, or next-generation sequencing.
  • Eastern Cooperative Oncology Group performance status of 0 or 1 and an expected survival of at least 3 months.
  • Adequate hematologic, hepatic, renal, coagulation, thyroid, and cardiac function, as defined in the protocol.
  • Negative pregnancy test for women of childbearing potential; agreement to use highly effective contraception, when applicable.

Exclusion Criteria:

  • Prior treatment with a PD-1 inhibitor, CTLA-4 inhibitor, or other immunotherapy.
  • Symptomatic or high-risk bowel obstruction, bleeding, perforation, pneumonitis, or other conditions that may compromise safe study participation.
  • Another malignancy diagnosed within 5 years before the first study treatment, except for specified definitively treated low-risk malignancies.
  • Current participation in another interventional clinical study, or receipt of another investigational drug or investigational device within 4 weeks before the first study treatment.
  • Active autoimmune disease requiring systemic treatment within 2 years before the first study treatment, or recent systemic corticosteroid or other immunosuppressive therapy.
  • Uncontrolled pleural effusion or ascites, prior allogeneic organ transplantation (except corneal transplantation), or allogeneic hematopoietic stem cell transplantation.
  • Known hypersensitivity to any study drug component.
  • Toxicities or complications from prior treatment not recovered to Grade 1 or baseline, except for specified conditions.
  • HIV infection, untreated active hepatitis B infection, or active hepatitis C infection.
  • Receipt of a live vaccine within 30 days before the first study treatment.
  • Pregnancy or breastfeeding.
  • Any serious or uncontrolled systemic disease, active infection, clinically significant laboratory abnormality, or other condition that may interfere with study participation or place the participant at unacceptable risk, as judged by the investigator.

Plan d'étude

Cette section fournit des détails sur le plan d'étude, y compris la façon dont l'étude est conçue et ce que l'étude mesure.

Comment l'étude est-elle conçue ?

Détails de conception

  • Objectif principal: Traitement
  • Répartition: N / A
  • Modèle interventionnel: Affectation à un seul groupe
  • Masquage: Aucun (étiquette ouverte)

Armes et Interventions

Groupe de participants / Bras
Intervention / Traitement
Expérimental: ctDNA-Guided Neoadjuvant Immunotherapy |

Participants receive PD-1 inhibitor monotherapy. ctDNA testing after 3-4 cycles determines whether they proceed to curative surgery or escalate to PD-1 plus CTLA-4 inhibitor therapy; all participants subsequently undergo curative surgery.
Médicament: PD-1 inhibitor

200 mg intravenously on Day 1 of each 3-week cycle. All participants receive initial monotherapy.

Médicament: CTLA-4 inhibitor

1 mg/kg intravenously on Day 1 of each 3-week cycle. Administered with the PD-1 inhibitor only to participants with persistent ctDNA positivity after 3-4 cycles of monotherapy.

Test diagnostique: ctDNA/MRD testing

Peripheral-blood ctDNA testing at baseline and after 3-4 cycles of monotherapy; every 2 cycles during combination therapy, when applicable; and 1 month after surgery.

Procédure: Curative Surgery

Curative surgery after ctDNA clearance or after no more than 4 cycles of combination treatment.

Que mesure l'étude ?

Principaux critères de jugement

Mesure des résultats
Description de la mesure
Délai
Pathological Complete Response Rate
Délai: At curative surgery, following completion of neoadjuvant therapy

Pathological assessment of the surgical resection specimen; pCR is defined as no residual viable cancer cells after treatment (ypT0N0M0).
At curative surgery, following completion of neoadjuvant therapy

Mesures de résultats secondaires

Mesure des résultats
Description de la mesure
Délai
Major Pathological Response Rate
Délai: At curative surgery, following completion of neoadjuvant therapy

Pathological assessment of the surgical resection specimen; MPR is defined as residual viable tumor cells ≤10%.
At curative surgery, following completion of neoadjuvant therapy
3-Year Event-Free Survival
Délai: From enrollment up to 3 years

Time from enrollment to first radiographic disease progression or death, whichever occurs first.
From enrollment up to 3 years
3-Year Overall Survival
Délai: From enrollment up to 3 years

Time from enrollment to death from any cause.
From enrollment up to 3 years
Concordance of ctDNA Status With Pathological Complete Response
Délai: After 3-4 cycles of PD-1 inhibitor monotherapy (21-day cycles) and at curative surgery; for persistent ctDNA positivity, every 2 cycles of PD-1 plus CTLA-4 inhibitor therapy (21-day cycles; up to 4 cycles).

Preoperative ctDNA status will be compared with postoperative pathological complete response results.
After 3-4 cycles of PD-1 inhibitor monotherapy (21-day cycles) and at curative surgery; for persistent ctDNA positivity, every 2 cycles of PD-1 plus CTLA-4 inhibitor therapy (21-day cycles; up to 4 cycles).
Concordance Between ctDNA Dynamics and Imaging Assessment
Délai: Baseline through curative surgery, up to 24 weeks (each cycle is 21 days).

ctDNA positivity, clearance, and dynamic changes will be compared with RECIST version 1.1 imaging response assessments.
Baseline through curative surgery, up to 24 weeks (each cycle is 21 days).
Number of Participants With Treatment-Emergent Adverse Events, as Assessed by CTCAE v5.0
Délai: From first dose through 30 days after the last dose.

Number and proportion of participants with at least one treatment-emergent adverse event, including treatment-related and immune-related adverse events.
From first dose through 30 days after the last dose.
Number of Participants With Grade 3 or Higher Treatment-Related Adverse Events, as Assessed by CTCAE v5.0
Délai: From first dose through 30 days after the last dose.

Number and proportion of participants with at least one Grade 3 or higher treatment-related adverse event.
From first dose through 30 days after the last dose.
Number of Participants With Serious Adverse Events
Délai: From first dose through 90 days after the last dose.

Number and proportion of participants with at least one serious adverse event.
From first dose through 90 days after the last dose.
Number of Participants With Treatment-Related Delay of Curative Surgery
Délai: From first dose through curative surgery up to 24 weeks

Number and proportion of participants whose curative surgery is delayed because of treatment-related toxicity, as determined by the investigator.
From first dose through curative surgery up to 24 weeks

Collaborateurs et enquêteurs

C'est ici que vous trouverez les personnes et les organisations impliquées dans cette étude.

Parrainer

Fudan University

Publications et liens utiles

La personne responsable de la saisie des informations sur l'étude fournit volontairement ces publications. Il peut s'agir de tout ce qui concerne l'étude.

Publications générales

Dates d'enregistrement des études

Ces dates suivent la progression des dossiers d'étude et des soumissions de résultats sommaires à ClinicalTrials.gov. Les dossiers d'étude et les résultats rapportés sont examinés par la Bibliothèque nationale de médecine (NLM) pour s'assurer qu'ils répondent à des normes de contrôle de qualité spécifiques avant d'être publiés sur le site Web public.

Dates principales de l'étude

Début de l'étude (Estimé)

14 septembre 2026

Achèvement primaire (Estimé)

31 décembre 2027

Achèvement de l'étude (Estimé)

31 décembre 2030

Dates d'inscription aux études

Première soumission

12 septembre 2026

Première soumission répondant aux critères de contrôle qualité

24 septembre 2026

Première publication (Réel)

25 septembre 2026

Mises à jour des dossiers d'étude

Dernière mise à jour publiée (Réel)

25 septembre 2026

Dernière mise à jour soumise répondant aux critères de contrôle qualité

24 septembre 2026

Dernière vérification

1 septembre 2026

Plus d'information

Termes liés à cette étude

Mots clés

Termes MeSH pertinents supplémentaires

Autres numéros d'identification d'étude

  • Neo-ctDNA-Colon

Plan pour les données individuelles des participants (IPD)

Prévoyez-vous de partager les données individuelles des participants (DPI) ?

NON

Description du régime IPD

Individual participant data, including de-identified data, will not be made available to external researchers. Study data will be processed and stored within China. Aggregate results may be published without identifiable participant information.

Informations sur les médicaments et les dispositifs, documents d'étude

Étudie un produit pharmaceutique réglementé par la FDA américaine

Non

Étudie un produit d'appareil réglementé par la FDA américaine

Non

Ces informations ont été extraites directement du site Web clinicaltrials.gov sans aucune modification. Si vous avez des demandes de modification, de suppression ou de mise à jour des détails de votre étude, veuillez contacter register@clinicaltrials.gov. Dès qu'un changement est mis en œuvre sur clinicaltrials.gov, il sera également mis à jour automatiquement sur notre site Web .

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