Radiotherapy Followed by Adjuvant Chemotherapy in NK/T-cell Lymphoma

Inclusion Criteria: * Age range 14-70 years old * Histological confirmed, previously untreated stage I/II NK/T cell lymphoma in the upper-aerodigestive tract * ECOG performance status 0-1 * Life expectancy of more than 3 months * Without prior history of pancreatitis * Adequate bone marrow and organ functions Exclusion Criteria: * Low risk population (Definition: stage I without local invasion, B symptoms and high LDH level) * Pregnant or lactating women * With contraindication of steroid including uncontrolled diabetes * Serious uncontrolled diseases and intercurrent infection * History of other malignancies except cured basal cell carcinoma of skin and carcinoma in-situ of uterine cervix