VP-16, Ifosfamide, Dexamethasone, L-asparaginase Chemotherapy in Patients With Extranodal Natural Killer T Cell Lymphoma (VIDL+ASCT)

Inclusion Criteria: * Histologically confirmed extranodal NK/T cell lymphoma * Aged between 19 and 65 years * Previously untreated history * Performance status: Eastern Cooperative Oncology Group 0-2 * Ann Arbor stage III and IV * At least one in positron emission tomograph(PET)/CT positive lesion or in 2-dimensional computerized tomography * mass lesions more than 2 cm by conventional CT or more than 1 cm by spiral CT * Skin lesions or physically detected mass more than 2 cm * Cardiac ejection fraction ≥ 45 % as measured by multiple gated acquisition scan(MUGA) or 2D echogram(ECHO) without clinically significant abnormalities * Adequate liver functions: Transaminase (AST/ALT) \< 3 X upper normal value(or \< 5 x upper limit of normal in the presence of NK/T lymphoma involvement of the liver) * Bilirubin \< 2 X upper normal value(or \< 5 x upper limit of normal in the presence of DLBCL involvement of the liver) * Serum Creatinine \< 2.0 mg/dL * Adequate bone marrow functions: hemoglobin ≥ 9 g/dL absolute neutrophil count (ANC) ≥ 1,500/μL and platelet count ≥ 75,000/μL, unless abnormalities are due to bone marrow involvement by lymphoma * Expected life is more than 180 days (more than 6 months) * A negative serum or urine pregnancy test prior to treatment must be available both for pre-menopausal women and for women who are \< 1years after the onset of menopause. Premenopausal women should be treated with appropriate contraception such as hormone contraception, intra-uterine device, spermicidal condom and etc. during and one month after the treatment. * Voluntarily signed the informed consent including fully understand of clinical procedures and processing steps for the clinical trial Exclusion Criteria: * Patients who have serious medical condition, abnormal laboratory results or psychiatric problems * Other subtypes non-Hodgkin's lymphoma than NK/T cell lymphoma * Patients who have aggressive NK/T cell leukemia * NK/T cell lymphoma with Primary Central Nervous System (CNS) involvement. However, patients who have only had prophylactic intrathecal chemotherapy against CNS disease are eligible. * Patients with a known history of HIV seropositivity or hepatitis C virus (HCV) (+). Patients who have carrier hepatitis B virus (HBV) (+) are eligible. However, primary prophylaxis using antiviral agents is recommended for HBV carrier to prevent HBV reactivation during whole treatment period. * Any other malignancies within the past 5 years except curatively treated non-melanoma skin cancer or in situ carcinoma of cervix uteri * Pregnant or lactating women, women of childbearing potential not employing adequate contraception * Other serious illness or medical conditions i. Unstable cardiac disease despite treatment, myocardial infarction within 6 months prior to study entry ii. History of significant neurologic or psychiatric disorders including dementia or seizures iii. Active uncontrolled infection (viral, bacterial or fungal infection) iv. Other serious medical illnesses * Concomitant administration of any other experimental drug under investigation, or concomitant chemotherapy, hormonal therapy, or immunotherapy. * Serious allergy history for experimental drugs * Patients who contraindication to the study drug use