Sintilimab With P-GemOx Regimen for Newly Diagnosed Advanced Extranodal Natural Killer/T-cell Lymphoma, Nasal Type

Inclusion Criteria: * biopsy proved extranodal natural killer/T-cell lymphoma, nasal type; * newly diagnosed stage III/IV patients; * at least one evaluable lesion； * ECOG PS 0-2; * 18-75 years; without other malignancy; * proper functioning of the major organs. Exclusion Criteria: * hemophagocytic syndrome or aggressive NK cell leukemia; * involvement of central nervous system; * previously received treatment of chemotherapy, radiotherapy, immunotherapy or biotherapy for lymphoma；