Nodes-sparing Short-course Radiation Combined With CAPOX and Tislelizumab for MSS Middle and Low Rectal Cancer

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

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Recruitment Status

RECRUITING

Clinical Phase

PHASE2

Total Enrollment

32 participants

Study Classification

INTERVENTIONAL

Study Start Date

2023-08-02

Study Completion Date

2026-05-01

Brief Summary

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This is an open-label, prospective, multicenter phase II clinical trial to evaluate modified short-course radiation (Radiation targeting the tumor bed without irradiating surrounding tumor-draining lymph nodes) combined with CAPOX and PD-1 Inhibitor (Tislelizumab) for patients with MSS middle and low rectal cancer. A total of 32 patients will be enrolled in this trial. The primary endpoint is the rate of pathological complete response (pCR). The organ preservation rate, tumor regression grade, long-term prognosis, and adverse effects will also be analyzed.

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Detailed Description

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Conditions

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Low Rectal Cancer

Study Design

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Allocation Method

NA

Intervention Model

SINGLE_GROUP

Primary Study Purpose

TREATMENT

Blinding Strategy

NONE

Study Groups

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Treatment Arm

Participants will receive 5\*5Gy modified short-course radiation (radiation targeting the tumor bed without irradiating surrounding tumor-draining lymph nodes) concurrently with CAPOX and tislelizumab regimens: Oxaliplatin, 130mg/m2, intravenous infusion,d1 of each cycle; Capecitabine, 1000mg/m2, PO, BID, d1-14 and tislelizumab, 200mg intravenous infusion d1 of each cycle. CAPOX and tislelizumab repeat every 3 weeks for 4 cycles, followed by total mesorectal excision surgery.

Group Type EXPERIMENTAL

Modified short-course radiotherapy

Intervention Type RADIATION

radiation targeting the tumor bed without irradiating surrounding tumor-draining lymph nodes: 25Gy/5Fx

PD-1 antibody

Intervention Type DRUG

PD-1 antibody (Tislelizumab): 200mg d1 q3w

Capecitabine

Intervention Type DRUG

Capecitabine: 1000mg/m2 d1-14 q3w

Oxaliplatin

Intervention Type DRUG

Oxaliplatin: 130mg/m2 d1 q3w

Interventions

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Modified short-course radiotherapy

radiation targeting the tumor bed without irradiating surrounding tumor-draining lymph nodes: 25Gy/5Fx

Intervention Type RADIATION

PD-1 antibody

PD-1 antibody (Tislelizumab): 200mg d1 q3w

Intervention Type DRUG

Capecitabine

Capecitabine: 1000mg/m2 d1-14 q3w

Intervention Type DRUG

Oxaliplatin

Oxaliplatin: 130mg/m2 d1 q3w

Intervention Type DRUG

Eligibility Criteria

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Inclusion Criteria

1. Patients who have a strong willingness to preserve the anus and are willing to receive neoadjuvant therapy.
2. Male or Female aged 18-75.
3. Patients diagnosed with low rectal cancer within 10 cm from the lower edge of the tumor to the anal verge by pelvic MRI and anorectoscopy, the clinical stage is cT2N+M0/cT3-4aN0/+M0, the lymph nodes are limited to the mesorectum, the circumferential resection margin is negative.
4. Histologically confirmed rectal adenocarcinoma; Genetic testing suggests MSI-L or MSS, or tumor biopsy immunohistochemistry reveals pMMR, that is, MSH1, MSH2, MSH6, and PMS2 are all positive.
5. Eastern Cooperative Oncology Group (ECOG) 0-1.
6. No previous treatment(including anti-tumor therapy、immunotherapy or pelvic radiation).
7. Adequate hematologic, hepatic, renal, thyroid and cardiac function: white blood cells ≥3500/mm3, neutrophils ≥1800/mm3, platelets ≥100,000/mm3, hemoglobin ≥100 g/L; activated partial thromboplastin time, prothrombin time and international normalized ratio ≤1.5 × ULN; aspartate aminotransferase and alanine aminotransferase ≤3.0 × upper limit of normal (ULN), bilirubin ≤1.25 × ULN, serum albumin ≥28 g/L. creatinine clearance ≥50 mL/mi, creatinine ≤1.5 × ULN;
8. Informed consent form signed.

Exclusion Criteria

1. Patients with a previous history of malignant tumors besides rectal cancer.
2. Patients with distant metastases before enrollment.
3. Patients with positive internal or external iliac lymph nodes are assessed by MRI or CT.
4. Patients with obstruction, perforation, or bleeding that require emergency surgery.
5. Patients with severe concomitant diseases and estimated survival time ≤ 5 years.
6. Allergic to any component of the therapy.
7. Patients with poorly differentiated adenocarcinoma, signet ring cell carcinoma, or mucinous adenocarcinoma.
8. Patients who received immunosuppressive or systemic hormone therapy for immunosuppressive purposes within 1 month prior to the initiation of therapy.
9. Patients who have received any other experimental drug (including immunotherapy) or participated in another interventional clinical trial within 30 days before screening.
10. Factors leading to study termination, such as alcoholism, drug abuse, other serious illnesses (including psychiatric disorders) requiring combination therapy, and patients with severe laboratory abnormalities.
11. Patients with congenital or acquired immune deficiency (such as HIV infection).
12. Vulnerable groups, including mentally ill, cognitively impaired, critically ill patients, minors, pregnant or lactating women, illiterate, etc.
13. Other conditions that investigators consider not suitable for this study.

Minimum Eligible Age

18 Years

Maximum Eligible Age

75 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No