A Study in Recurrent or Metastatic Cervical Cancer Patients With PD-L1 Positive

GB226 is administrated at the dose of 3mg/kg, once per 2 weeks (±3 days), and distributed in 100ml of 0.9% sodium chloride solution. The concentration of GB226 shall be strictly controlled at 1mg/ml\~10mg/ml, the duration is 60 min (±10 min) for the first infusion of the drug, and can be reduced to 30 min (±10 min) for the subsequent infusion of the drug if there is infusion related adverse reaction.