A Study for PD-1 Antibody JS001 in MSI-H Advanced or Recurrent Colorectal Cancer

Inclusion Criteria:

• Fully understand the study and sign informed consent voluntarily;

• Histologically confirmed advanced or recurrent colorectal cancer, and MSI detectionidentified MSI-H;

• Patients who have previously received first-line or above chemotherapy or targetedtherapy and failed to the treatment or experienced recurrence;

• At least one measurable lesion (RECIST 1.1);

• Agree to provide tumor tissue samples and Pathology reports related to the specimens;

• Aged 18 to 75 years, gender not limited;

• Eastern Cooperative Oncology Group(ECOG) performance status(PS) 0-1; 8. Expectedsurvival ≥3 months;

• Laboratory test values must meet the following standards within 7 days beforeenrollment;

• Women of reproductive age must confirm that the serum pregnancy test is negative andagree to use effective contraceptive measures during the study drug use

Exclusion Criteria:

• Uncontrolled or symptomatic hypercalcemia;

• Had major surgery or had not fully recovered from previous surgery within 4 weeksbefore enrollment;

• central nervous system(CNS) metastases;

• Bone metastases;

• Uncontrolled pleural effusion, pericardial effusion, or ascites requiring repeateddrainage (once a month or more frequently) allow the patient to have a catheterindwelling;

• Having a history of idiopathic pulmonary fibrosis, organic pneumonia;

• Uncontrolled active infection, including but not limited to acute pneumonia;

• Have other malignant tumors at the same time;

• The patient has any active autoimmune diseases or a history of autoimmune diseases;

• Liver diseases of known clinical significance, including active viral viral hepatitis,alcoholic hepatitis or other hepatitis, cirrhosis, fatty liver and hereditary liverdiseases.

• Previous use of anti-PD-1 antibody, anti-PD-l1 antibody, anti-PD-l2 antibody oranti-CTLA-4 antibody;

• Patients with active tuberculosis (TB);

• Received systemic immunosuppressive within 4 weeks prior to day 1 of the first cycle;

• Pregnancy test positive;

• Known human immunodeficiency virus (HIV) infection;

• A history of severe allergy, anaphylaxis or other hypersensitivity reactions tochimeric or humanized antibodies or fusion proteins;

• Those who are known to be allergic to biological drugs produced by hamster ovary cellsin China, or to citric acid monohydrate, sodium citrate dihydrate, mannitol andpolysorbate (components of the experimental drugs);

• Patients who have previously received allogeneic stem cells or parenchymal organtransplantation.