Study Evaluating the Safety and Efficacy of Astarabine in Acute Myeloid Leukemia or Acute Lymphoblastic Leukemia

"Cohort # Astarabine Dose Number of Patients~1. 0.5 gr/m2 (0.3 age\>50) 3~2. 1.5 gr/m2(0.8age\>50) 3~3. 3.0 gr/m2(1.5 age\>50) 3~4. 4.5 gr/m2(2.3 age\>50) 6~5. 4.5 gr/m2 (no age limit) 3 up to 6~6. 6 gr/m2 (no age limit) 3 up to 6~Total number of patients: up to 24"