The Efficacy of Watch and Wait Strategy or Surgery After Neoadjuvant Immunotherapy for Locally Advanced Colorectal Cancer With dMMR/MSI-H Guided by MRD Dynamic Monitoring: A Single-center, Open-label, Prospective, Phase II Clinical Trial.

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

Get a concise snapshot of the trial, including recruitment status, study phase, enrollment targets, and key timeline milestones.

Recruitment Status

RECRUITING

Total Enrollment

22 participants

Study Classification

OBSERVATIONAL

Study Start Date

2023-10-30

Study Completion Date

2026-10-30

Brief Summary

Review the sponsor-provided synopsis that highlights what the study is about and why it is being conducted.

This study is a single arm, single center, phase II, prospective clinical study aimed at exploring the effectiveness and safety of watch and wait strategy guided by dynamic minimal disease residual (MRD) monitoring to achieve clinical complete response after neoadjuvant immunotherapy for locally advanced colorectal cancer with deficient mismatch repair/ microsatellite instability-high (dMMR/MSI-H).

Related Clinical Trials

Explore similar clinical trials based on study characteristics and research focus.

Watch and Wait in PD-1 Monoclonal Antibody Treated dMMR/MSI-H Distal Rectal Cancer

NCT04643041

Rectal Cancer

RECRUITING NA

Exploring the Treatment Duration of PD-1 Neoadjuvant Therapy in Stage II-III dMMR Rectal Cancer

NCT06613165

RECRUITING

Treatment Strategy for Rectal Cancer Patients With Complete Clinical Response

NCT03846726

Rectal Cancer Organ Preservation

COMPLETED

Total Neoadjuvant Therapy Followed by 'Watch and Wait' Approach or Organ Preservation for Low-risk Rectal Cancer

NCT04405206

Rectum Cancer

UNKNOWN

Biomarkers for Predicting Neoadjuvant Chemoradio-resistance for Middle-low Advanced Rectal Cancer

NCT03573791

Rectal Cancer Cancer of Rectum Cancer of the Rectum +4 more

RECRUITING

Detailed Description

Dive into the extended narrative that explains the scientific background, objectives, and procedures in greater depth.

Conditions

See the medical conditions and disease areas that this research is targeting or investigating.

Clinical Complete Response Rate With Negative MRD

Study Design

Understand how the trial is structured, including allocation methods, masking strategies, primary purpose, and other design elements.

Observational Model Type

CASE_ONLY

Study Time Perspective

PROSPECTIVE

Interventions

Learn about the drugs, procedures, or behavioral strategies being tested and how they are applied within this trial.

Tireilizumab（PD-1 inhibitor）

Neoadjuvant immunotherapy phase :

1. Pharmaceuticals: Tireilizumab: 200mg, intravenous infusion, Q3W, at least 4 cycles, the number of specific neoadjuvant immunotherapy cycles was determined according to the results of MRD dynamic monitoring.
2. MRD dynamic monitoring time node: dynamic monitoring at the initial diagnosis and after the fourth cycle of neoadjuvant immunotherapy. Blood monitoring points were 1-2 weeks after immunotherapy. If the two consecutive MRDs were negative, the watch and wait strategy was adopted. If the MRD was still positive after 8 cycles of neoadjuvant immunotherapy, surgical treatment was performed.

Intervention Type DRUG

Eligibility Criteria

Check the participation requirements, including inclusion and exclusion rules, age limits, and whether healthy volunteers are accepted.

Inclusion Criteria

* ( 1 ) Disease characteristics 1. Histologic confirmation for colorectal adenocarcinoma; 2．Immunohistochemical identified as dMMR and/or pCR and/or NGS detection for MSI-H; 3．According to UICC/AJCC TNM staging system (in 2017 version 8) assessment for locally advanced colorectal cancer (II - III, namely cT3-4 and/or N + ）； 4.\* clinical staging methods: colon CT staging, approved by pelvic magnetic resonance imaging (MRI) and the rectum rectum cavity ultrasound combined with staging, 5．No signs of intestinal obstruction;Or intestinal obstruction after proximal colon obstruction has been relieved after colostomy surgery; 6．No distant metastasis was confirmed by comprehensive examination (distant organs or (and) the distant lymph node metastasis); ( 2 ) Previous treatment 1．No colorectal cancer surgery before; 2. No previous chemotherapy or radiotherapy ; 3. had not received biological treatment ; 4. Previous endocrine therapy : no restriction.

Exclusion Criteria

* 1.Immunohistochemistry of tumor biopsy specimens suggested pMMR or microsatellite instability detection suggested MSS ; 2. Chronic hepatitis B or C ( high-copy viral DNA ) with a history of HIV infection or active phase ; 3.Autoimmune diseases ; 4.Other active clinical severe infections ( \> NCI-CTC3.0 version ) ; 5. patients with clinical stage I ; 6.Preoperative evidence of distant metastasis ; 7. cachexia, organ dysfunction ; 8. Have a history of pelvic or abdominal radiotherapy ; 9. Patients whose seizures require treatment ( e.g. steroids or antiepileptic treatment ) ; 10.5 years have a history of other malignant tumors, except for cured cervical carcinoma in situ or skin basal cell carcinoma ; 11. Chronic inflammatory bowel disease, intestinal obstruction ; 12. Drug abuse and medical, psychological or social conditions may interfere with patient participation in the study or have an impact on the evaluation of the results of the study ; 13.Known or suspected allergies to the study drug or any drug related to this test ; any unstable condition or condition that may endanger patient safety and compliance ;

Minimum Eligible Age

18 Years

Maximum Eligible Age

75 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No