Concomitant Chemo-radiotherapy Followed by MIDLE Chemotherapy in Stage I/II Extranodal NK/T-cell Lymphoma

Inclusion Criteria:

• patients were required to have a biopsy-proven diagnosis of nasal ENKTL
• at least 18 years old
• Ann Arbor stage IE or IIE
• measurable disease
• Eastern Cooperative Oncology Group (ECOG) performance status of 0-2 life expectancy greater than 12 weeks
• adequate hematologic (hemoglobin > 9.0 g/dL, absolute neutrophil count > 1,500/uL and platelets > 100,000/uL)
• renal (serum creatinine < 1.5 mg/dL, creatinine clearance > 50 mL/min)
• hepatic (total bilirubin < 2 times of upper limit of normal and aspartate transferase < 3 times of upper limit of normal) function
• Diagnosis of ENKTL is based on the presence of histological features and immunophenotypes compatible with ENKTL (e.g., cytoplasmic CD3+, CD20-, CD56+,
• positive for cytotoxic molecules
• positive for EBV by in situ hybridization).
• Informed consent

Exclusion Criteria:

• prior or concomitant malignant tumors
• any coexisting medical problems of sufficient severity to prevent full compliance with the study protocol.
• ENKTL with non-nasal sites such as skin or gastrointestinal tract was excluded even if it is localized.
• Other subtypes of non-Hodgkin lymphoma (NHL), including myeloid/NK cell precursor acute leukemia, blastic NK cell lymphoma/precursor NK cell lymphoblastic leukemia, aggressive NK cell leukemia, and peripheral T cell lymphoma, unspecified, were excluded.