Safety & Efficacy of Peg-ASP-based CCRT in Early Stage ENKTL

Inclusion Criteria: 1.The patient was pathologically diagnosed as ENKTL and had not received any previous treatment for ENKTL;2.The estimated survival time ≥ 3 months. 3.18-75 years old ; 4. Ann-Arbor stage was IE-IIE ; 5. ECOG performance status 0-2 ; 6.Clinicians judged that patients were suitable for concurrent chemoradiotherapy ; 7.No radiotherapy or hormone drugs were received within 4 weeks before treatment;8.After the patients were enrolled in the trial, they could not accept other drugs that may have therapeutic effects on ENKTL ; 9.WBC≥ 3 × 109 / L, NE ≥ 1.5 × 109 / L, PLT ≥ 100 × 109 / L ; 10.Serum creatinine ≤ 1.5mg / dL, creatinine clearance rate ≥ 50mL / min ; 11.ALT, AST ≤ 3 × ULN ( normal upper limit ) ; total bilirubin ≤ 2 × ULN ; 12.Serum fibrinogen level ≥ 1.0g / L ; 13.Signed informed consent form. Exclusion Criteria:1.Symptomatic CNS involvement, previous or current accompanied by other malignant tumors ; 2.The primary lesion is ENKTL from non-upper respiratory gastrointestinal tract ; 3.Patients with poor general condition, ECOG performance status \>2 ; 4.Women in pregnancy or lactation; 5.The patient ( male or female ) has the possibility of fertility but is unwilling or does not take effective contraceptive measures; 6. Known allergies to test drugs or any excipient component of these products ;7.Doctors believe that patients are not suitable for concurrent chemoradiotherapy; 8.Active infection ( determined by the researcher ) ; 9.According to the researchers ' judgment, there are concomitant diseases that seriously endanger the safety of patients or affect the completion of the study;10. Have a clear history of neurological or psychiatric disorders, including epilepsy or dementia.