There are 4 treatment groups of increasing doses of HE2000; each group consists of 2 parts (Part A and B). Part A is a single administration of HE2000 injected intramuscularly, and Part B is 5 consecutive daily intramuscular injections of HE2000. Patients receive the same dosage throughout Parts A and B of the study. Patients are asked to return to the clinic periodically for blood sample collection. Patients may remain at the hospital overnight for pharmacokinetic evaluation. Drug safety, tolerance, efficacy, and pharmacokinetics are measured. Samples from treatment Group 4 are analyzed for specific cell function.