A Study of PD-1/CTLA-4 Bispecific AK104 in Relapsed or Refractory Peripheral T-cell Lymphoma

Inclusion Criteria: * Patients with histologically or cytologically confirmed advanced Peripheral T-cell lymphoma. * Relapsed or refractory disease after at least 1 prior systemic treatment for the primary malignancy and not a candidate for other curative treatments. * Eastern Cooperative Oncology Group (ECOG) physical fitness score is 0 or 1. * Adequate organ functions * Effective methods of contraception. * Ability to provide written informed consent and to be compliant with the schedule of protocol assessments. Exclusion Criteria: * Patients diagnosed as adult T cell lymphoma / leukemia (ATLL). * Any prior exposure to PD-1/PD-L1、CTLA-4 targeting agents. * Previous allogeneic stem cell transplant within 3 months prior to enrolment, active graft vs host disease (GVHD), or requiring transplant-related immunosuppression. * Serious systemic infections or local infections during the 2 months before screening. * History of cancer in 5 years before screening., including solid tumors and hematological malignancies (except basal cell and in situ squamous cell carcinomas of the skin that have been excised and resolved). * Have a known allergy or hypersensitivity to any biologic therapy at screening that would pose an unacceptable risk to the subject if participating in this study. * Has enrolled in any other trials during 3 months prior to screening or concurrently enrolled in any other trials. * Received allogeneic organ transplantation or allogeneic hematopoietic stem cell transplantation. * Subjects who received immunomodulatory drugs in 4 weeks before screening, including thymosin, interferon and interleukin, et al. * Patients who received radiotherapy, chemotherapy, targeted therapy (except TKI), immunotherapy within 4 weeks before screening, and patients who received TKI drugs within 2 weeks before screening.