Cytarabine and Clofarabine in Treating Patients With Refractory or Relapsed Acute Myeloid Leukemia or Acute Lymphoblastic Leukemia [clinicaltrials:NCT00295841]

Cytarabine and Clofarabine in Treating Patients With Refractory or Relapsed Acute Myeloid Leukemia or Acute Lymphoblastic Leukemia [clinicaltrials:NCT00295841]