ARM I: Patients undergo delayed-type hypersensitivity (DTH) skin testing with oregovomab and a standard anergy panel (i.e., mumps, Candida, and tetanus toxoid) on day 0 (at baseline) and at week 14. The skin test response is measured 48 hours later. Patients receive cyclophosphamide IV on day 6 and oregovomab IV over 20 minutes on day 9 or 10. Patients then receive oregovomab alone at weeks 6 and 10 and then every 12 weeks for up to 2 years (10 doses) in the absence of disease progression or unacceptable toxicity.