S0910 Epratuzumab, Cytarabine, and Clofarabine in Treating Patients With Relapsed or Refractory Acute Lymphoblastic Leukemia

OBJECTIVES: * To test whether the complete remission (CR) rate (CR and incomplete CR) in adult patients with relapsed or refractory precursor B-cell acute lymphoblastic leukemia is sufficiently high after treatment with cytarabine, clofarabine, and epratuzumab to warrant further investigation. * To estimate the frequency and severity of toxicities associated with the dosing schedule of cytarabine, clofarabine, and epratuzumab used in this study. * To investigate, preliminarily, the effect of laboratory correlates (minimal post-treatment residual disease) and cytogenetic factors on prognosis in this patient population. (Not reported here due to limited MRD data) OUTLINE: This is a multicenter study. Patients receive cytarabine IV over 2 hours on days 1-5, clofarabine IV over 1 hour on days 2-6, and epratuzumab IV over at least 1 hour on days 7, 14, 21, and 28 in the absence of disease progression or unacceptable toxicity\*. NOTE: \* Prophylactic intrathecal methotrexate is required for patients \< 22 years of age, and is recommended (but not required) for patients ≥ 22 years of age. Blood samples, bone marrow samples, and/or tumor tissue samples may be collected for further laboratory analysis. Patients are followed up every 3 months for 2 years, then annually for 3 years (until 5 years after registration).