A Phase II Study of Dexamethasone, Azacitidine, Pegaspargase and Tislelizumab Plus Radiotherapy for Patients With Stage I/II Extranodal NK/T-cell Lymphoma

Patients receive 6 cycles of DAPT regimen plus concurrent radiotherapy. The DAPT regimen is administered as follows: dexamethasone 10mg intravenously on days1-3, azacitidine 100mg subcutaneously on days 1-5, pegaspargase 2500IU/m2 intramuscularly on day 1, and tislelizumab 200mg intravenously on day 6, repeated every 21 days. Concurrent radiotherapy given to the tumor sites is started after 2 cycles of DAPT regimen. The specific doses and methods of radiotherapy are in accordance with the clinical guidelines for NK/T-cell lymphoma.