Node-Sparing Short-Course Radiation with CAPOX and Sintilimab for MSS Locally Advanced Colon Cancer: a Randomized, Prospective, Multicenter Study

Last updated: September 10, 2024
Sponsor: Sir Run Run Shaw Hospital
Overall Status: Active - Not Recruiting

Phase

2

Condition

Colon Cancer

Colorectal Cancer

Treatment

Node-Sparing Short-Course Radiotherapy Combined with CAPOX and Sintilimab

CAPOX Chemotherapy

Clinical Study ID

NCT06594692
mRCAT-C
  • Ages > 18
  • All Genders

Study Summary

This study aims to evaluate the use of node-sparing short-course radiotherapy combined with chemotherapy and Sintilimab, or chemotherapy alone, as neoadjuvant therapy for MSS-type locally advanced colon cancer. The goal is to explore the efficacy and safety of combining node-sparing short-course radiotherapy with chemotherapy and immunotherapy in the neoadjuvant setting for MSS-type locally advanced colon cancer, while also investigating the specific role of regional lymph nodes in tumor immunotherapy.

Eligibility Criteria

Inclusion

Inclusion Criteria:

  1. Patients willing to undergo neoadjuvant treatment. 2. Age ≥ 18 years. 3. Tumorconfirmed by colonoscopy and enhanced abdominal CT to be ≥ 12 cm from the analverge.

  2. Histologically diagnosed adenocarcinoma; genetic testing indicates MSI-L orMSS, or immunohistochemistry from tumor biopsy shows pMMR (all fourproteins-MSH1, MSH2, MSH6, and PMS2-are positive).

  3. Clinical staging by enhanced abdominal CT evaluates as cT3-4N0-2M0. 6. ECOGperformance status score of 0-1. 7. No prior treatment with anti-tumor,immunotherapy, or abdominal radiation therapy before enrollment.

  4. Blood test results (without transfusion within 14 days and no use ofgranulocyte colony-stimulating factor or other hematopoietic stimulators within 7 days before the lab test):

  5. White blood cell count ≥ 3.5 × 10^9/L, absolute neutrophil count ≥ 1.5 × 10^9/L, platelet count ≥ 100 × 10^9/L, hemoglobin concentration ≥ 9 g/dL;

  6. Liver function tests (bilirubin ≤ 1.5 × ULN; AST and ALT ≤ 5 × ULN);

  7. Renal function (serum creatinine ≤ 1.5 × ULN or creatinine clearance (CCr) ≥ 50mL/min);

  8. Coagulation (INR ≤ 1.5 × ULN, PT and APTT ≤ 1.5 × ULN);

  9. Thyroid function: TSH ≤ upper limit of normal (ULN); if abnormal, FT3 and FT4levels must be evaluated, and if FT3 and FT4 are normal, the patient iseligible.

  10. Voluntary participation with a signed informed consent form.

Exclusion

Exclusion Criteria:

  1. History of other malignancies within the past 5 years. 2. Patients withmetastases in other locations (stage IV). 3. Patients with MSI-H or dMMR. 4.Patients with conditions such as bowel obstruction, perforation, or bleedingrequiring emergency surgery.

  2. Known allergy to the study drug or any of its excipients. 6. Patients with anyunstable systemic diseases, including but not limited to severe infections,uncontrolled diabetes, uncontrolled hypertension, unstable angina,cerebrovascular accidents or transient ischemic attacks, myocardial infarction,congestive heart failure, or severe illnesses requiring medication (such asarrhythmias, liver, kidney, or metabolic diseases) that are life-threatening.

  3. History of active autoimmune diseases requiring systemic treatment (e.g.,disease-modifying drugs, corticosteroids, or immunosuppressants) within thelast 2 years. Replacement therapies (e.g., thyroid hormone, insulin, orphysiological corticosteroid replacement for adrenal or pituitaryinsufficiency) are not considered systemic treatments.

  4. Known history of HIV infection or acquired immunodeficiency syndrome (AIDS). 9.Receipt of any investigational drug (including immunotherapy) or participationin another interventional clinical study within 30 days before screening.

  5. Pregnant or breastfeeding women, or women planning to become pregnant orbreastfeed during the study; men or women unwilling to use effectivecontraception during the study.

  6. Vulnerable populations, including those with mental illness, cognitiveimpairment, or critically ill patients.

  7. Any other conditions deemed inappropriate for participation by theinvestigator.

Study Design

Total Participants: 140
Treatment Group(s): 2
Primary Treatment: Node-Sparing Short-Course Radiotherapy Combined with CAPOX and Sintilimab
Phase: 2
Study Start date:
October 01, 2024
Estimated Completion Date:
September 30, 2026

Study Description

Colorectal cancer is currently one of the most common malignant tumors in China. According to the latest data released by the National Cancer Center, it ranks second in incidence and fourth in mortality among all cancer types. Statistics indicate that approximately 50% of colon cancer patients in China are in stages II-III. Currently, adjuvant chemotherapy regimens containing oxaliplatin and 5-fluorouracil are the standard treatment for stage III and high-risk stage II colon cancer patients. However, under standard treatment protocols, the 5-year disease-free survival (DFS) rate for stage III colon cancer is less than 64%, with a recurrence rate exceeding 20%. Patients with higher T and N stages face a significantly increased risk of recurrence, severely impacting survival rates and imposing a substantial burden on both the healthcare system and society.

Neoadjuvant chemotherapy, which is administered before surgery, offers several theoretical advantages, including shrinking the primary tumor to improve surgical resection rates, reducing intraoperative tumor cell spread, and eliminating micrometastases and subclinical lesions to lower the risk of postoperative metastasis. However, data on neoadjuvant chemotherapy for locally advanced colon cancer remains limited. The FOxTROT study found that preoperative neoadjuvant chemotherapy significantly reduced the 2-year recurrence rate for locally advanced colon cancer, achieved tumor downstaging, and provided a 4% pathological complete response (pCR) rate. This study also demonstrated a strong correlation between pathological response to neoadjuvant therapy and recurrence risk, with patients achieving pCR or major pathological response (mPR) having significantly lower recurrence rates.

Recent studies have shown that combining immunotherapy with radiotherapy has a synergistic effect, even in MSS-type colorectal cancer patients. Radiotherapy can induce immunogenic cell death, releasing tumor-associated antigens and enhancing the function of dendritic cells, thereby increasing T-cell infiltration. Moreover, chemotherapy can alter the tumor microenvironment, promote angiogenesis, and improve oxygen distribution, further enhancing the efficacy of radiotherapy. One prospective phase II clinical trial involving locally advanced rectal cancer patients showed promising results, with a pCR rate of 46.2% in patients with proficient mismatch repair (pMMR), suggesting a favorable response to neoadjuvant therapy.

Lymph nodes, as secondary lymphoid organs, play a crucial role in tumor diagnosis and treatment. Recent preclinical studies have shown that tumor-draining lymph nodes (TDLNs) are essential in antigen activation and effector T-cell differentiation. On the other hand, tertiary lymphoid structures (TLS), which are organized immune cell aggregates formed in non-lymphoid tissues, have been associated with improved prognosis in cancer patients. However, the role of TDLNs in immunotherapy remains underexplored.

Based on these findings, the research team hypothesizes that tumor-draining lymph nodes play a positive role in immunotherapy response, and sparing these nodes during radiotherapy may enhance the efficacy of immunotherapy for MSS-type colorectal cancer. The team previously conducted a phase II clinical study (NCT04503694) investigating the safety and efficacy of node-sparing short-course radiotherapy combined with CAPOX chemotherapy and PD-1 inhibitors in MSS-type locally advanced rectal cancer. Results showed a 100% response rate to neoadjuvant therapy, with a pCR rate of 78.8% and a major pathological response (mPR) rate of 91%, while maintaining a high rate of organ preservation.

Given the high recurrence rates and treatment challenges associated with locally advanced colon cancer, and building on the promising results of previous studies, the research team intends to conduct the mRCAT-C study. This study aims to explore the clinical efficacy and safety of a node-sparing short-course radiotherapy combined with immunotherapy as a neoadjuvant treatment for MSS-type locally advanced colon cancer.

Connect with a study center

  • Sir Run Run Shaw Hospital, Zhejiang University

    Hangzhou, Zhejiang 310016
    China

    Site Not Available

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