A Phase II Clinical Study to Assess the Efficacy and Safety of IBI310 or Placebo Combined With Sintilimab for Advanced Cervical Cancer Subjects Who Have Failed or Cannot Tolerate First-line or Above Platinum-based Chemotherapy

Inclusion criteria

• The subject must sign the written informed consent form, and can comply with the visits and related procedures specified in the protocol.
• Aged ≥18 years and ≤75 years.
• Diagnosed with cervical cancer by histology/cytology.
• Patients with relapsed or metastatic cervical cancer who have had progressed or relapsed after receiving at least first-line of platinum-based chemotherapy (if a patient has progressed or relapsed during or within 6 months after receiving platinum-based neoadjuvant or adjuvant chemotherapy, she will be deemed to have received first-line treatment).
• The subject's previous systemic treatment must have ended ≥4 weeks before the first study administration, and the treatment-related AEs have recovered to Common Terminology Criteria for Adverse Events (CTCAE) V5.0 grade ≤1 (except for alopecia and fatigue).

Exclusion criteria

• Diagnosis of other malignant tumors within 5 years before the first administration, excluding radically cured skin basal cell carcinoma, skin squamous cell carcinoma, radically resected carcinoma in situ and/or thyroid papillary carcinoma.
• Pleural effusion, ascites, and pericardial effusion with clinical symptoms or requiring drainage (patients with effusion that does not require drainage or patients with no significant increase in the effusion within 3 days after stopping drainage can be selected).
• Patients who are planning to undergo or have previously received organ or bone marrow transplantation.
• Patients with acute or chronic active hepatitis B or C infection, hepatitis B virus (HBV) DNA> 200 IU/ml or 103 copies/ml; hepatitis C virus (HCV) antibody positive and HCV-RNA level higher than the lower limit of detection. Patients with acute or chronic active hepatitis B or C infection who have received nucleotide antiviral therapy and are below the above standards can be selected.
• Meningeal metastases or symptomatic central nervous system (CNS) metastases. Patients with asymptomatic brain metastases who do not need treatment with glucocorticoids, anticonvulsants or mannitol after radiotherapy can be enrolled.