Short-course Radiotherapy Followed by Tislelizumab + CapeOX in the Treatment for Locally Advanced Rectal Cancer

A Single -Centers, Randomized, Open-label, Controlled Phase Ⅱ Clinical Trial of Short-course Radiotherapy Followed by Tislelizumab + CapeOX in the Treatment for Locally Advanced Rectal Cancer

This study is a single-center, prospective, open-label, randomized controlled clinical study, and the purpose of this study was to compare the pathological complete response rate (PCR) of patients with locally advanced rectal cancer treated with short-course radiotherapy sequential Tislelizumab combined with CapeOX (group A) versus short-course radiotherapy sequential CapeOX (group B). A total of 100 patients with locally advanced rectal cancer will be enrolled in the study. These patients were randomly assigned to the experimental group (group A) and the control group (group B) in a ratio of 1:1.

Study Overview

• Status: Completed
• Conditions: Locally Advanced Rectal Cancer
• Intervention / Treatment: Radiation: Short-course radiotherapy; Drug: Tislelizumab; Drug: Capecitabine+Oxaliplatin

Detailed Description

Baseline examnation: All enrolled patients in this study, in addition to routine laboratory and imaging examinations such as blood routine, blood biochemistry, serum tumor markers (Incl. CEA, CA-199, CA-724 β2-microglobulin, Ferroprotein), chest CT, abdominal and pelvic MRI, etc., were required to undergo KRAS, NRAS, BREF, PD-L1, MMR/MSS testings before SCRT, and blood lymphocyte subgroups were analyzed before SCRT, systemic therapy, and surgery.

Subjects in group A will be treated according to the following treatment plan:

Standard SCRT: A total radiation dose of 25 Gy was delivered in 5 fractions (from day 1 to 5)

Sequential treatment period: After resting for 3-7 days following completion of SCRT, patients were treated with 4 cycles of CapeOX (Oxaliplatin 130 mg/m2 intravenously, day 1; Capecitabine 1000 mg/m2, Bid,days 1-14) and an additional intravenous infusion of 200mg Tislelizumab on the first day of each cycle of CapeOX.

Surgery: After 3 weeks of the completion of neoadjuvant therapy, the TME surgery was performed.

Postoperative adjuvant chemotherapy:Whether postoperative chemotherapy was implemented mainly depended on the patient's wishes, and 2 cycles of CapeOX with or without Tislelizumab will be undergone to these willing cases.

Subjects in group B will be treated according to the following treatment plan:

Standard SCRT: A total radiation dose of 25 Gy was delivered in 5 fractions (from day 1 to 5)

Sequential treatment period: After resting for 3-7 days following completion of SCRT, patients were treated with 4 cycles of CapeOX (Oxaliplatin 130 mg/m2 intravenously, day 1; Capecitabine 1000 mg/m2, Bid,days 1-14).

Surgery: After 3 weeks of the completion of neoadjuvant therapy, the TME surgery was performed.

Postoperative adjuvant chemotherapy:Whether postoperative chemotherapy was implemented mainly depended on the patient's wishes, and 2 cycles of CapeOX will be undergone to these willing cases.

Endpoint: The primary endpoint was pCR rate. Secondary endpoints included MPR (TRG0+TRG1), 3-year PFS, 3-year OS, and treatment safety.

Follow-up records during treatment: For the duration of operation, the time required to complete the TME surgery and the amount of blood loss were recorded, and the impact of neoadjuvant therapy on the operation was observed. During the SCRT process, and the period of resting after SCRT, of the entire preoperative systemic treatment, of the resting after TME surgery, of the postoperative chemotherapy (these willing cases), the occurrence of adverse events (AE) of participants were closely monitored and actively responded.

• Study Type: Interventional
• Enrollment (Actual): 118
• Phase: Phase 2

Contacts and Locations

Study Locations

• China
  • Hebei
    • Shijiazhuang, Hebei, China, 050011
      • Fourth Hospital of Hebei Medical University

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 75 years (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

Patients or their family members agree to participate in the study and sign the informed consent form;

Patients ≥ 18 and ≤75 years old, male or female;

ECOG performance status of 0 or 1;

Patients with histologically confirmed rectal adenocarcinoma;

The clinical diagnosis of chest CT, abdominal and pelvic enhanced MRI was T1-2N+M0 and cT3-4NanyM0 (the T and N stage was based on pelvic enhanced MRI+DWI, M stage was determined by liver enhanced MRI+DWI and chest CT, and if necessary, PET-CT was used);

The distance between the lower edge of the tumor and the anal edge is less than or equal to 10 cm;

No history of immune system diseases;

No history of immunodeficiency, including HIV positive;

No history of other malignancies;

No history of myocarditis;

No history of severe cardiovascular and cerebrovascular diseases;

No history of thyroid dysfunction;

No history of liver and kidney diseases;

No history of mental illness, no history of Infectious diseases;

No history of organ transplantation or allogeneic bone marrow transplantation;

There is no history of other systemic diseases other than the above diseases;

Voluntarily accept the neoadjuvant treatment scheme of radiotherapy, sequential chemotherapy / chemotherapy combined with immunotherapy;

Swallowing pills normally;

Rectal cancer without radiotherapy, chemotherapy, surgery, Chinese medicine anti-tumor treatment, etc.;

Surgical treatment is planned after neoadjuvant treatment.

Exclusion Criteria:

Patients who do not meet the above inclusion criteria;

Documented history of allergy to study drugs, including any component of Tislelizumab, capecitabine, oxaliplatin and other platinum drugs;

Patients who need to be treated with corticosteroid (dose equivalent to prednisone of >10 mg/day) or other immunosuppressive agents within 2 weeks prior to study drug administration; Major surgery or severe trauma within 4 weeks before the first use of the study drug;

Severe infection (CTCAE > 2) occurred within 4 weeks before the first use of the study drug; Baseline chest imaging revealed active pulmonary inflammation, signs and symptoms of infection within 14 days prior to the first use of the study drug, or oral or intravenous antibiotic therapy, except for prophylactic use of antibiotics;

Female patients who is pregnant or breastfeeding;

Patients who refuse to sign informed consent by themselves or their authorized persons;

Patients with poor cognitive ability, unable to answer questions, unable to fill in questionnaires or mental disorders;

Patients considered unsuitable for the study by the investigator.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Short-course radiotherapy sequential Tislelizumab combined with CapeOX (group A); Standard SCRT: A total radiation dose of 25 Gy was delivered in 5 fractions (from day 1 to 5) Sequential treatment period: After resting for 3-7 days following completion of SCRT, patients were treated with 4 cycles of CapeOX (Oxaliplatin 130 mg/m2 intravenously, day 1; Capecitabine 1000 mg/m2, Bid,days 1-14) and an additional intravenous infusion of 200mg Tislelizumab on the first day of each cycle of CapeOX. Surgery: After 3 weeks of the completion of neoadjuvant therapy, the TME surgery was performed. Postoperative adjuvant chemotherapy: Whether postoperative chemotherapy was implemented mainly depended on the patient's wishes, and 2 cycles of CapeOX with or without Tislelizumab will be undergone to these willing cases.	Radiation: Short-course radiotherapy; Patients were treated with short-course neoadjuvant radiotherapy; Drug: Tislelizumab; Patients were treated with Tislelizumab on the first day of each cycle of CapeOX (Capecitabine+Oxaliplatin).; Drug: Capecitabine+Oxaliplatin; Patients were treated with neoadjuvant chemotherapy with CapeOX (Capecitabine+Oxaliplatin).
Active Comparator: Short-course radiotherapy sequential CapeOX (group B); Standard SCRT: A total radiation dose of 25 Gy was delivered in 5 fractions (from day 1 to 5) Sequential treatment period: After resting for 3-7 days following completion of SCRT, patients were treated with 4 cycles of CapeOX (Oxaliplatin 130 mg/m2 intravenously, day 1; Capecitabine 1000 mg/m2, Bid,days 1-14). Surgery: After 3 weeks of the completion of neoadjuvant therapy, the TME surgery was performed. Postoperative adjuvant chemotherapy: Whether postoperative chemotherapy was implemented mainly depended on the patient's wishes, and 2 cycles of CapeOX will be undergone to these willing cases.	Radiation: Short-course radiotherapy; Patients were treated with short-course neoadjuvant radiotherapy; Drug: Capecitabine+Oxaliplatin; Patients were treated with neoadjuvant chemotherapy with CapeOX (Capecitabine+Oxaliplatin).

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Pathological complete response rate	Pathological complete response rate was defined as the absence of viable tumour cells in the resected primary tumour specimen and all sampled regional lymph nodes (ypT0N0)	1 week after surgery

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
major pathologic response (TRG0+TRG1)	TRG 0 indicates no remaining viable cancer cells (complete response); TRG 1 indicates a single cell or small groups of cancer cells (moderate response)	1 week after surgery
3-year PFS	PFS refers to the time from randomization to tumor progresses or death from any cause	3 years from randomization
3-year OS	OS refers to the time from randomization to death from any cause	3 years from randomization
Incidence of Treatment-Emergent Adverse Events [Safety and Tolerability]	Incidence of Treatment-Emergent Adverse Events [Safety and Tolerability] during treatment, including chemoradiotherapy, immunology, sugery	through study completion, an average of 1 year

Collaborators and Investigators

• Sponsor: Hebei Medical University Fourth Hospital

Study record dates

Study Major Dates

• Study Start (Actual): September 1, 2021
• Primary Completion (Actual): July 30, 2024
• Study Completion (Actual): August 20, 2024

Study Registration Dates

• First Submitted: September 15, 2021
• First Submitted That Met QC Criteria: October 7, 2021
• First Posted (Actual): October 21, 2021

Study Record Updates

• Last Update Posted (Actual): August 22, 2024
• Last Update Submitted That Met QC Criteria: August 21, 2024
• Last Verified: August 1, 2024

More Information

Terms related to this study

• Keywords: Locally advanced rectal cancer; Immune checkpoint inhibitors; Neoadjuvant radiotherapy; Programmed death-1 inhibitor
• Additional Relevant MeSH Terms: Digestive System Diseases; Neoplasms; Neoplasms by Site; Gastrointestinal Neoplasms; Digestive System Neoplasms; Gastrointestinal Diseases; Intestinal Diseases; Intestinal Neoplasms; Rectal Diseases; Colorectal Neoplasms; Rectal Neoplasms; Molecular Mechanisms of Pharmacological Action; Antimetabolites, Antineoplastic; Antimetabolites; Antineoplastic Agents; Antineoplastic Agents, Immunological; Capecitabine; Oxaliplatin; Tislelizumab
• Other Study ID Numbers: 2021104

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No