Pretarget radiotherapy with an anti-CD25 antibody-streptavidin fusion protein was effective in therapy of leukemia/lymphoma xenografts Academic Article uri icon


MeSH Major

  • Antibodies, Monoclonal
  • Leukemia
  • Lymphoma
  • Radioimmunotherapy
  • Receptors, Interleukin-2
  • Recombinant Fusion Proteins
  • Streptavidin


  • Although radioimmunotherapy with radiolabeled intact monoclonal antibodies has demonstrated efficacy in the treatment of lymphoma, it provides low tumor-to-normal-tissue radionuclide target ratios and unwanted prolonged radiation exposure to the bone marrow. To overcome these obstacles, the administration of the radionuclide was separated from that of the antibody by using an anti-IL-2 receptor alpha antibody single chain Fv-streptavidin fusion protein, followed by radiolabeled biotin to treat lymphoma or leukemia xenografted mice. This Pretarget approach provided extremely rapid and effective tumor targeting, permitting the use of short-lived alpha-emitting radionuclides. With the beta-emitter (90)Y, all of the 10 lymphoma-xenografted mice were cured. With the alpha-emitter (213)Bi, significant efficacy was obtained in treating leukemic mice, and, furthermore, when combined with immunotherapy, 7 of 10 leukemic mice were cured. Thus, Pretarget radioimmunotherapy is very promising and could represent the next generation in the treatment of lymphoma and leukemia.

publication date

  • February 18, 2003



  • Academic Article



  • eng

PubMed Central ID

  • PMC149929

Digital Object Identifier (DOI)

  • 10.1073/pnas.0437788100

PubMed ID

  • 12569172

Additional Document Info

start page

  • 1891

end page

  • 5


  • 100


  • 4