Short-Course Radiotherapy, Nal-IRI, Capecitabine, and Camrelizumab for Locally Advanced MSS Rectal Cancer

NCT07521605 · tracked via the Priya Life Science China tracker

Sponsor

Guangdong Provincial People's Hospital

Phase

Phase 2

Started

2026-05-20

Last updated

2026-04-13

Condition(s) studied

Rectal Cancer Patients

Investigational drug(s) / intervention(s)

Short-Course RadiotherapyLiposomal Irinotecan (nal-IRI) →Capecitabine →Camrelizumab →

Short-Course Radiotherapy: Short-course radiotherapy is a radiation therapy regimen delivered over a condensed period. In this study, patients will receive a total dose of 25 Gray (Gy), administered in 5 fractions (5 Gy per fraction), delivered once daily over five consecutive days. This intervention constitutes the initial phase of the neoadjuvant treatment protocol.

Liposomal Irinotecan (nal-IRI): Liposomal irinotecan is a nanoliposomal formulation of the chemotherapeutic agent irinotecan, designed to enhance tumor drug delivery and reduce systemic toxicity. In this study, it will be administered intravenously at a dose of 60 mg/m² on Day 1 of each 21-day cycle, for a total of 8 cycles, following the completion of short-course radiotherapy.

Capecitabine: Capecitabine is an oral fluoropyrimidine carbamate prodrug that is converted to 5-fluorouracil in the body. In this study, it will be administered orally at a dose of 1000 mg/m² twice daily (BID) from Days 1 to 14 of each 21-day cycle, for a total of 8 cycles, in combination with liposomal irinotecan and camrelizumab.

Camrelizumab: Camrelizumab is a humanized monoclonal antibody that targets the programmed cell death-1 (PD-1) receptor on immune cells, functioning as an immune checkpoint inhibitor. In this study, it will be administered intravenously at a fixed dose of 200 mg on Day 1 of each 21-day cycle, for a total of 8 cycles, in combination with liposomal irinotecan and capecitabine.

Study summary

This study is for adults with locally advanced rectal cancer that has not spread to distant organs, and is classified as pMMR or MSS (which means it typically does not respond well to immunotherapy alone). The purpose is to see if a new combination of treatments given before surgery (neoadjuvant therapy) can more effectively shrink the tumor and increase the chance of curing the cancer or avoiding surgical removal of the rectum.

The main things you will do in this study are:

1. Receive a Short Course of Radiation Therapy (5 treatments over 1 week).
2. After a 1-week break, receive a combination of three drugs:

1）Nal-IRI (a special form of the chemotherapy drug Irinotecan, designed to have fewer side effects) 2）Capecitabine (a chemotherapy pill) 3）Camrelizumab (an immunotherapy drug) 3. This drug combination is given in 8 cycles, with each cycle lasting 3 weeks. 4. After finishing all cycles, the doctors will carefully check how the tumor responded.

The most important goal of this research is to see how many patients achieve a "Complete Response," which means:

1. No sign of cancer cells in the surgically removed tissue (Pathological Complete Response, pCR), or
2. No sign of cancer can be found through clinical exams, scans, and scopes, allowing the patient to avoid immediate surgery under a "Watch and Wait" strategy (Clinical Complete Response, cCR).

Researchers will also monitor:

1. The safety of the treatment and its side effects.
2. How well the cancer is controlled over time (e.g., 3-year survival without cancer recurrence).
3. The rate of successful tumor removal and the rate of preserving the anus.

Eligibility

Sex

ALL

Min age

18 Years

Max age

75 Years

Healthy volunteers

Inclusion Criteria: 1. Aged 18 to 75 years, male or female. 2. Histologically confirmed diagnosis of rectal adenocarcinoma. 3. Confirmed mismatch repair proficient (pMMR) or microsatellite stable (MSS) status by immunohistochemistry or PCR methods. 4. Locally advanced disease assessed by pelvic MRI, classified as cT3-4aN0M0 or any T stage with node-positive (N+) disease, without distant metastasis (M0), according to the AJCC 8th edition staging system. 5. The lower edge of the tumor is located within 10 cm from the anal verge (defined as low/mid rectal cancer). 6. Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1. 7. Adequate bone marrow, hepatic, and renal function, defined as: Absolute Neutrophil Count (ANC) ≥ 1.5 x 10⁹/L，Platelet count ≥ 100 x 10⁹/L，Hemoglobin ≥ 90 g/L，Total Bilirubin ≤ 1.5 times the Upper Limit of Normal (ULN)，Alanine Aminotransferase (ALT) and Aspartate Aminotransferase (AST) ≤ 2.5 x ULN，Serum creatinine ≤ 1.5 x ULN or Creatinine Clearance ≥ 50 mL/min (calculated by Cockcroft-Gault formula) 8. Voluntarily participates in the study, signs the informed consent form, demonstrates good compliance, and is able to cooperate with follow-up procedures. Exclusion Criteria: 1. Evidence of distant metastasis (M1 disease) on baseline imaging. 2. Previous radiotherapy to the pelvis, or any prior systemic chemotherapy, targeted therapy, or immunotherapy for colorectal cancer. 3. History of other active malignancies within the past 5 years, except for adequately treated carcinoma in situ of the cervix, basal cell carcinoma of the skin, or other localized tumors considered cured by local treatment. 4. Any of the following uncontrolled conditions or comorbidities: 1）Severe active infection requiring systemic therapy. 2）Unstable angina, myocardial infarction, or congestive heart failure (NYHA Class II-IV) within the last 6 months. 3）Uncontrolled epilepsy, central nervous system disorders, or psychiatric disorders that would compromise the ability to provide informed consent or comply with study procedures. 5\. Known history of severe immunodeficiency or active autoimmune disease requiring systemic immunosuppressive therapy (e.g., corticosteroids at doses \> 10mg/day prednisone equivalent) within the past 2 years. 6\. Known history of hypersensitivity to any component of the study drugs (Liposomal Irinotecan, Capecitabine, Camrelizumab) or history of severe hypersensitivity reactions to other monoclonal antibodies. 7\. Pregnant or lactating women, or subjects of childbearing potential who are unwilling to use highly effective contraception during the study period and for at least 6 months after the last dose of study treatment. 8\. Any other condition or circumstance that, in the opinion of the investigator, would compromise the patient's safety or adherence to the protocol (e.g., inability to swallow oral medications, active gastrointestinal bleeding, intestinal obstruction).

Primary outcome measure(s)

Complete Response Rate — From the start of treatment until approximately 2 weeks after the completion of all neoadjuvant therapy, assessed over a period of approximately 24-26 weeks.
The primary endpoint is the Complete Response (CR) rate after completion of neoadjuvant therapy, which is a composite of pathological complete response (pCR) and clinical complete response (cCR). 1. pCR is defined as the absence of viable tumor cells in the surgical specimen (TRG1a according to the Becker tumor regression grading system) in patients who undergo surgery. 2. cCR is defined as the achievement of a ycT0N0 status, assessed by clinical evaluations (including digital rectal exam, endoscopy, MRI, etc.), in patients who enter a "Watch and Wait" strategy without immediate surgery.

Trial sites (1)

Facility	City	Region	Status
Guangdong Provincial People's Hospital	Guangzhou	Guangdong

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Official registry record

This page summarises publicly available registry data for informational purposes — not medical advice. Eligibility is determined by each study team; patients should discuss participation with their clinician.

View NCT07521605 on ClinicalTrials.gov ↗ ← All trials in China