AHN-12 Biodistribution in Advanced Leukemia

A dose escalation schema will be used with the initial patient receiving the current lowest dose of nonradiolabeled AHN-12 (from 0.20 mg/kg to 1.0 mg/kg). If a favorable biodistribution is not achieved and the patient remains negative for HAMA, the infusion may be repeated up to two more times (with a one level increase in nonradiolabeled AHN-12 each time) in an attempt of achieving favorable biodistribution. In order to achieve the primary objective of identifying the optimal nonradiolabeled dose of AHN-12 antibody for all patients, if the first patient at the current antibody dose does not achieve favorable biodistribution, the next patient(s) will be treated at the next higher dose level. Patients achieving favorable biodistribution and remaining negative for HAMA will be eligible for the therapeutic component of this trial. Those not meeting these requirements will be taken off study and followed.