A Phase II Study of Tislelizumab as Adjuvant Therapy for Patients With Stage Ⅱ and Stage Ⅲ Colon Cancer and dMMR/MSI.

A Phase II Study of Tislelizumab as Adjuvant Therapy for Patients With High-risk Stage Ⅱ and Stage Ⅲ Colon Cancer and Deficient Mismatch Repair or Microsatellite Instability.

10%-15% of early-stage colon cancers harbour either deficient mismatch repair (dMMR), microsatellite instability high (MSI-H) is characterised by high tumour mutational burden and increased lymphocytic infiltrate. Metastatic dMMR colon cancers are highly sensitive to immune checkpoint inhibition.The MSI phenotype is associated with a better prognosis than MSS in stage II and III CRCs. However, there are conflicting data about the benefit of adjuvant chemotherapy in this group of patients.

We are conducting a single arm study phase II trial to determine if the anti-PD-1 antibody Tislelizumab improves disease-free survival (DFS) in patients with high risk stage II and stage III dMMR/MSI-H colon cancer.

Study Overview

• Status: Not yet recruiting
• Conditions: Colon Cancer
• Intervention / Treatment: Drug: Tislelizumab

Detailed Description

This study is a phase II, single arm study with main purpose to evaluate the safety, tolerability and efficacy of Tislelizumab as adjuvant therapy for patients with high-risk stage Ⅱ and stage Ⅲ colon cancer and deficient mismatch repair or microsatellite instability.

Tumour MMR status will be routinely tested locally as per NICE guidelines (either in the pre-operative biopsy or resection specimen). Subjects whose tumours are dMMR can sign the main study consent and undergo the study screening procedures.All eligible patients receive received 200 mg Tislelizumab intravenously every 3 weeks until disease progression, unacceptable adverse events (AEs) or withdrawal of consent. The maximum duration of the trial intervention period was 1 year.

• Study Type: Interventional
• Enrollment (Anticipated): 70
• Phase: Phase 2

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion Criteria:

1. Male or female subjects aged ≥18 years
2. ECOG PS 0/1
3. Histologically proven, high-risk stage II (i.e., T3 or T4, N0, M0) and III (i.e., any T, N1 or N2, M0) adenocarcinoma of the colon (as defined by the presence of the inferior pole of the tumour above the peritoneal reflection - that is, at least 15 cm from the anal margin).
4. Fully surgically resected tumour with clear resection margins (i.e., >1 mm)
5. Locally confirmed defective mismatch repair (dMMR) tumour (as defined by the lack of staining on either the pre-operative biopsy samples or resection specimens of at least one of the following proteins: MLH1 (mutL homolog 1), MSH2 (mutS homologue 2), MSH6 (mutS homolog 6).
6. Patients with testing that did not show dMMR (loss of MMR protein) are not eligible to participate; patients whose tumors show MSI-H by polymerase chain reaction (PCR)-based assay are not eligible to participate unless they also have MMR testing by IHC and are found to have dMMR (i.e. loss of one or more MMR proteins).
7. Absence of metastases as shown by post-operative CT scan.
8. No prior medical therapy (chemotherapy, immunotherapy, biologic or targeted therapy) or radiation therapy for the current colon cancer except for one cycle of mFOLFOX6.
9. Absence of major post-operative complications or other clinical conditions that, in the opinion of the investigator, would contraindicate adjuvant chemotherapy 8. Adequate hematological function defined by absolute neutrophil count (ANC) ≥1.5 × 109/L, platelet count ≥100 × 109/L, and hemoglobin ≥9 g/dL (blood transfusion before recruitment is allowed)
10. Adequate hepatic function defined by a total bilirubin level ≤1.5 × the upper limit of normal (ULN) range and AST and ALT levels ≤2.5 × ULN 10. Adequate renal function defined by an estimated creatinine clearance ≥30 mL/min according to the Cockcroft-Gault formula (or local institutional standard method) 11. Negative serum or urine pregnancy test at screening for women of childbearing potential 12. Fertile men and women must agree to take highly effective contraceptive precautions during, and for 6 months after the last dose of chemotherapy or for 1 month after the last dose of Tislelizumab

Exclusion Criteria:

1. Rectal tumours (as defined by the presence of the inferior pole of the tumour below the peritoneal reflection - that is, <15 cm from the anal margin).
2. Administration of neoadjuvant systemic chemotherapy or radiotherapy before surgical resection of colon cancer
3. Has a diagnosis of immunodeficiency or is receiving systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of trial treatment.
4. Has a history of non-infectious pneumonitis that required steroids; currently active non-infectious pneumonitis; or evidence of interstitial lung disease.
5. Has an active infection requiring systemic therapy or history of uncontrolled infection.
6. Pregnancy or lactation
7. Known alcohol or drug abuse
8. Known severe hypersensitivity reactions to monoclonal antibodies (Grade ≥3 NCI-CTCAE v5.0), any history of anaphylaxis, or uncontrolled asthma (that is, 3 or more features of partially controlled asthma)
9. Clinically significant (i.e., active) cardiovascular disease: cerebral vascular accident/stroke (<6 months prior to enrollment), myocardial infarction (<6 months prior to enrollment), unstable angina, congestive heart failure (≥ New York Heart Association Classification Class II), or serious cardiac arrhythmia requiring medication
10. Known history of colitis, pneumonitis and pulmonary fibrosis (for example, inflammatory bowel disease, uncontrolled asthma), which, in the opinion of the Investigator, might impair the subject's tolerance of trial treatment.
11. Any psychiatric condition that would prohibit the understanding or rendering of informed consent
12. Vaccination within 4 weeks of the first dose of Avelumab and while on trial is prohibited except for administration of inactivated vaccines

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Tislelizumab	Drug: Tislelizumab; All eligible patients receive received 200 mg Tislelizumab intravenously every 3 weeks until disease progression, unacceptable adverse events (AEs) or withdrawal of consent.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Primary End point: Disease Free survival [ Time Frame: 3 years ]	Disease-free survival (DFS) at 3 years. DFS is measured from the date of randomisation to the date of first relapse (radiological or clinical) or death from any cause.	3 years

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Overall survival	the time from randomization to death, from any cause	5 years
Incidence of adverse events	Incidence of adverse events	Up to 30 days after last treatment

Collaborators and Investigators

• Sponsor: The First Affiliated Hospital of Zhengzhou University

Study record dates

Study Major Dates

• Study Start (Anticipated): March 1, 2022
• Primary Completion (Anticipated): September 1, 2023
• Study Completion (Anticipated): September 1, 2027

Study Registration Dates

• First Submitted: February 7, 2022
• First Submitted That Met QC Criteria: February 7, 2022
• First Posted (Actual): February 9, 2022

Study Record Updates

• Last Update Posted (Actual): February 9, 2022
• Last Update Submitted That Met QC Criteria: February 7, 2022
• Last Verified: February 1, 2022

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Digestive System Diseases; Neoplasms; Neoplasms by Site; Gastrointestinal Neoplasms; Digestive System Neoplasms; Gastrointestinal Diseases; Colonic Diseases; Intestinal Diseases; Intestinal Neoplasms; Colorectal Neoplasms; Colonic Neoplasms
• Other Study ID Numbers: Wfeng-001

Drug and device information, study documents

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